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# [Official Thread] OCR MEI AS Mathematics 2016 (C1, C2 & S1)

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1. (Original post by Studious_Student)
i) When a = 5 the sequence oscillates, so the remainder would be 2, x 5 = 10 for the second term, the 3rd term would be 1 since 10/3 has a remainder of one, x 5 = 5 for the third term, this goes back to 10 for the fourth term. 10+5+10 = 25.

ii) When a = 6 there is no remainder to multiply by 5, so the sequence would be 0,0,0,0. the sum of these would be 0.
Thanks
2. (Original post by ♥Samantha♥)
What are you serious with that log question? I put -3m! Wtf is wrong with OCR why do they hate brackets?!?!?? Screwing us over for no reason we basically have to guess what they mean which doesn't test what we know.
-3m is right. Isnt it?
3. I forgot 180 degrees in that sine question fcccckkkkkk
4. (Original post by Mr Moon Man)
How did you get that?
You are asked to find the Sum of a series Un between U2 and U4

you are told that the next term in a series is:

(remainder of the previous term when divided by 3) x 5

i) U1 = a = 5, so:

Sum from 2 to 4 = U2 + U3 + U4 = 10 + 5 + 10 = 25

ii) U1 = a = 6, so:

Sum for 2 to 4 = U2 + U3 + U4 = 0 + 0 + 0 = 0 (because when 6 is divided by 3 the remainder is 0 and zero times or divided by a number is 0 so all terms after U1, will be zero.
5. After the exam I thought it's gone really well but now I'm realising all these stupid mistakes.
6. (Original post by OGGUS)
I think I got a like 50%. Worst exam ever
I don't think I even got 50% and I'm retaking lol!

I didn't understand any of the section B questions.
7. (Original post by ♥Samantha♥)
What are you serious with that log question? I put -3m! Wtf is wrong with OCR why do they hate brackets?!?!?? Screwing us over for no reason we basically have to guess what they mean which doesn't test what we know.
8. (Original post by Slenderman)
-3m is right. Isnt it?
Idk people r saying its -m^3
9. (Original post by Shipreck)
That isn't what the question was. The question was -loga(a^m)^3 = -loga(a^3m) = -3m.
That's exactly what I've put into the calculators. You can't multiply the powers because the bracket is just defining which terms to log. The cube is for the whole loga(a^m) term. As I said, OCR are missing out brackets which has lead to this confusion but I'm fairly certain that it's -3^m
10. (Original post by Akhawais)
That's exactly what I've put into the calculators. You can't multiply the powers because the bracket is just defining which terms to log. The cube is for the whole loga(a^m) term. As I said, OCR are missing out brackets which has lead to this confusion but I'm fairly certain that it's -3^m
There was a question exactly like this a few years back and based on the answer to that older question it should be -3m
11. (Original post by Mr Moon Man)
There was a question exactly like this a few years back and based on the answer to that older question it should be -3m
http://www.mei.org.uk/files/papers/2012_Jan_c2.pdf

Question 4
12. Yeah I guess. Like I said, OCR need to use brackets. You can see in part i and iii that there are no brackets around the term which is confusing.
13. Can anyone remember exactly what the question with the f(x) and h stuff was?

And were you meant to find the value of h or just simplify the equation?

14. Can someone explain why I only got two values? thanks
15. (Original post by tizzaclaire98)

Can someone explain why I only got two values? thanks
Sin(X)=0 for 0,180, and 360
16. What was the value of theta for the sector question again? I remember somewhat that the radius was 12
17. (Original post by tizzaclaire98)

Can someone explain why I only got two values? thanks
If you were to factorise out the sin y, you would get sin y = 1/4 OR 0

You've found the values for 1/4 but missed the values for if sin were 0 (0, 180 and 360)
18. (Original post by ant1greeny)
Can anyone remember exactly what the question with the f(x) and h stuff was?

And were you meant to find the value of h or just simplify the equation?
You were meant to simplify it
19. (Original post by Studious_Student)
What was the value of theta for the sector question again? I remember somewhat that the radius was 12
1.8 I believe? Probably wrong though!
20. (Original post by ant1greeny)
Can anyone remember exactly what the question with the f(x) and h stuff was?

And were you meant to find the value of h or just simplify the equation?
Its a differentiation by first principles question.

Q:
y = x^2 - 2x
find dy/dx on the chord between x=5 and x=5.1.

A:
8.1

Q:
given that f(x) = x^2 - 2x
find (f(5+h) - f(5))/h

A:
sub 5+h for x:
(5+h)^2 - 2(5+h) = 25+10h+h^2 -10 -2h = 15 +8h +h^2
minus f(x) sub 5 for x:
15+8h+h^2 - (25-10)= 8h+h^2
Divide by h:
8 + h

Q:

A:
deltay/deltax = 8 + h
as h tends to 0, gradient tends to 8, so dy/dx = 8

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