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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 toA. 480B. 770C. 960D. 1040 |
| Answer» Correct Answer - A | |