C2 arithmetic series question
I'm stuck on part (b), I've found that k=31, could someone tell me how to finish the question please? Thanks in advance!
Original post by mica-lwe
I'm stuck on part (b), I've found that k=31, could someone tell me how to finish the question please? Thanks in advance!
Use the n(a+L)/2 formula. You know L, as it is Uk, and a is U1 which is given, and n will just be the number of terms (cough 31-1 cough).
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