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Maths Post your doubts and your exam date mine is may 6 P2 and may 12 P4

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for this question part d) i knw how to find the major arc. but why are we multiplying 39 into 4.
paper 42 may june 2013 q4)d)
 
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I'm stuck on this question, from O580/43/O/N/13 (October November 2013, 43, IGCSE)

It's Question 9ci and 9cii

c) The total number of lines in the first n diagram is 1/2n^3 + pn^2 + qn

i) When n=1, show that p+q=8.5


ii) By choosing another value of n and using the equation in part (c)(i), find the values of p and q.

Need help ASAP.

Link to the paper: http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_w13_qp_43.pdf
 
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tomorrows the last day we will be facing maths! (unless some of u r taking it in the future) i knw im nt!
 
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