Answers to Senior Maths Challenge!!!

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Juwel
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#1
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For all those who did the SMC, your teachers actually have the answers and send off your marks to the organising body type thing. After collecting all our answer sheets our teacher marked them in front of us. You get 4 per right answer, -1 per wrong answer, 0 for not attempting the question, and 25 just for doing it. Our teacher later gave us the answers. So here goes:

1- D
2- A
3- A
4- C
5- A
6- B
7- C
8- E
9- B
10- B
11- C
12- C
13- A
14- E
15- B
16- A
17- C
18- E
19- E
20- B
21- B
22- C
23- B
24- A
25- B

Hope you did well, and can I get some rep for divulging this? (Even though it's now OK to do so...)

By the way I got 83. From the answers above how did you think you did?
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TK0
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hey thats useful info. dont spose u got a scan of the question paper? werent allowed 2 keep ours 4 some reason. never mind. spose i did ok
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Juwel
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(Original post by TK0)
hey thats useful info. dont spose u got a scan of the question paper? werent allowed 2 keep ours 4 some reason. never mind. spose i did ok
Sorry TK0, I lost my copy of the questions, I had to phone my mate to get the answers from his question paper. Surprising no-one else replied to this before...
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sock
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(Original post by ZJuwelH)
For all those who did the SMC, your teachers actually have the answers and send off your marks to the organising body type thing. After collecting all our answer sheets our teacher marked them in front of us. You get 4 per right answer, -1 per wrong answer, 0 for not attempting the question, and 25 just for doing it. Our teacher later gave us the answers. So here goes:

1- D
2- A
3- A
4- C
5- A
6- B
7- C
8- E
9- B
10- B
11- C
12- C
13- A
14- E
15- B
16- A
17- C
18- E
19- E
20- B
21- B
22- C
23- B
24- A
25- B

Hope you did well, and can I get some rep for divulging this? (Even though it's now OK to do so...)

By the way I got 97. From the answers above how did you think you did?
I got 57, lol. I know that's bad *shrugs* I made some really stupid mistakes. Oh well. I know people who have done worse.
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Juwel
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Maybe this thread will get more attention when the other mathematicians among us log on tomorrow (or later on today, whatever).
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Bigcnee
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How could you get 97?

edit: Sorry, I didnt read 25 just for doing it!
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Juwel
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(Original post by Bigcnee)
How could you get 97?

edit: Sorry, I didnt read 25 just for doing it!
Oops sorry, I actually got 83! (Not 83 factorial :rolleyes: ) Huh, I was doing my sats coursework at the time and got figures messed up in my head. I wish I got 97...
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Unregister
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I think some of the answers above are wrong. eg question 25 you say b one solution yet the answer is d 3 solutions (1/7 +2/133=3/19) (1/13+2/247=3/19) (1/19+2/19=3/19
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It'sPhil...
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(Original post by Unregister)
I think some of the answers above are wrong. eg question 25 you say b one solution yet the answer is d 3 solutions (1/7 +2/133=3/19) (1/13+2/247=3/19) (1/19+2/19=3/19
yeah thats right. i got 86, someone at my school got 125
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LH
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I was invited to do the intermediate Maths challenge - lol.

Someone from my school is on the olympiad team. Unfortunatly, he fits the geek - no friends - no social life stereotype.
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theone
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And the answer to question 10 is wrong
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theone
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#12
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And to q15
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theone
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Incidentally, it looks like I got 121.
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theone
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I believe the respective answers to 10 and 15 are D and D.
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LH
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(Original post by theone)
Incidentally, it looks like I got 121.
Wow that's very good. But you should have worked harder for the other four marks. You obviously lack commitment to the subject
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theone
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#16
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(Original post by Lord Huntroyde)
Wow that's very good. But you should have worked harder for the other four marks. You obviously lack commitment to the subject
I lacked the visualisation for one question (q23) - v disappointing
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theone
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#17
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Anyone agree that the answers to 10, 15 and 25 are wrong? Any other incorrect answers? (I can't spot any).
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Micky
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(Original post by theone)
I lacked the visualisation for one question (q23) - v disappointing
I sat staring at that one for ages trying to see it, eventually got it right though, and managed a proof that satisfied me
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theone
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#19
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(Original post by Micky)
I sat staring at that one for ages trying to see it, eventually got it right though, and managed a proof that satisfied me
What about 10, 15 and 25 though?
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Micky
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k, I've got a copy of the paper, here's the answers I get:

1 D
2 A
3 A
4 C
5 A
6 B
7 C
8 E
9 B
10 D
11 C
12 C
13 A
14 E
15 ?
16 A
17 C
18 E
19 E
20 B
21 B
22 ?
23 B
24 A
25 ? (probably D, though)

I'm afraid I haven't worked out 15, though it's not A or B (since obviously 1 and 2003squared are both factors, but I couldn't see a straightforward way to prove any of the others), and don't have a proof for 25, it's all very well citing 3 pairs as answers, but I wouldn't like to conjecture the answer was D without a formal proof (do you have one?).


Does anyone have a proof for 22, all I noticed was that D is the sum of all the numbers from 1 to 100, but couldn't see how to fit that to the question :?
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