Question

If nth term of AP is 5n-3 then the sum of first 10 terms is?

Answer 1

Answer:

First term = 2

Second term = 7

Third term = 12

Common term = 5

$sum = \frac{10}{2} (2 \times 2 + 9 \times 5) \\ \\ = 5(4 + 45) = 5 \times 49 = 245$

Answer 2

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