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    (Original post by AlfieH)
    Can someone please explain the summation = 517 I suck at those haha!

    You had do what ever the top value was sum - the bottom n -1 sum

    (And then use this idea to do the quadratic for the 6marker in the next part)
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    (Original post by Zallin98)
    Thats what i got i think!
    Unfortunately we're wrong The power was supposed to be n (20) not n-1.
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    (Original post by ella_chloe)
    7/8
    5, maybe a 6...
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    How did everyone prove that the answer was 517 for one of the summations question?
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    Had problems with the sum to 2750 question, kept on mucking up the quadratic so in the end i got 23.9, how many marks do you think i will drop?
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    (Original post by eyenarbi)
    I also got that but idk what is the gradient of 5 for?
    You must integrate twice and to first integration gives dy/dx and hence this gradient allows you to find out the first c (the -7)
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    (Original post by DominoMatrix227)
    How did everyone prove that the answer was 517 for one of the summations question?
    The question was the sum from 10 to 20 of Un i think. You had to do the sum of 1 to 20 and then take away the sum of 1 to 9. As a result you got 670 - 153 i think
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    (Original post by AlfieH)
    Can someone please explain the summation = 517 I suck at those haha!
    I worked out the sum of the first 9 terms and then the sum of the first 20 terms using the formula book and subtracted them from each other since it asked for the sum between 10-20
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    (Original post by AlfieH)
    Think you could be my C2 Doppelgänger?
    Lol, I hope you weren't 3 minutes late to the exam
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    (Original post by eyenarbi)
    I also got that but idk what is the gradient of 5 for?
    When you integrate d2y/dx2, to find c, I think
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    (Original post by ella_chloe)
    laugh at what sorry?
    I think 60 is a little high for that paper, there was a lot of random jazz on it. I found it ok, but everyone I spoke to found it pretty hard going
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    (Original post by Brian luiz)
    Had problems with the sum to 2750 question, kept on mucking up the quadratic so in the end i got 23.9, how many marks do you think i will drop?
    Hi would you remind me of the initial quadratic? It was 5N2 + 5N -55000 = 0? or was it
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    (Original post by AlfieH)
    Can someone please explain the summation = 517 I suck at those haha!
    Sum from 10 to 20
    = Sum from 1 to 20 - Sum from 1 to 9

    20/2 (2a+19d) - 9/2 (2a+8d)
    = 517
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    (Original post by Nuvertion)
    Unfortunately we're wrong The power was supposed to be n (20) not n-1.
    i dont know what i put honestly! I got both answers but cant remember what i put as my final one!
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    Can someone remind me of the amount of marks per question so i can tally up an approximation of what I got?
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    (Original post by Mr_hawaii)
    I think 60 is a little high for that paper, there was a lot of random jazz on it. I found it ok, but everyone I spoke to found it pretty hard going
    oh i my question was if i get 60/72 would i get an A i wasnt predicting the boundary!
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    (Original post by doommiinniikky)
    The question was the sum from 10 to 20 of Un i think. You had to do the sum of 1 to 20 and then take away the sum of 1 to 9. As a result you got 670 - 153 i think
    Well I got 670 but got 150 for the next bit, subtracted this then subtracted 3 (I stated a=3). Wondering how many marks I'll get
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    Was the 2750 question and ap or gp?

    Posted from TSR Mobile
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    (Original post by RIPJakeSpliff)
    how do dis I no no it how u no get it. peasy paper u scrubs even I (an art student) got it.
    RIPjakespliff u sound like u no ur stuff
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    (Original post by TCO)
    Was the 2750 question and ap or gp?

    Posted from TSR Mobile
    Arithmetic
 
 
 
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