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Let a(1),a(2),a(3)"……." be an arithmetic...

Let `a_(1),a_(2),a_(3)"……."` be an arithmetic progression and `b_(1), b_(2), b_(3), "……."` be a geometric progression sequence `c_(1),c_(2),c_(3,"…."` is such that `c_(n)= a_(n) + b_(n) AA n in N`. Suppose `c_(1) = 1, c_(2) = 4, c_(3) = 15` and `c_(4) = 2`.
The value of sum of `sum_(i = 1)^(20) a_(i)` is equal to

A

480

B

770

C

960

D

1040

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The correct Answer is:
A
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