Question

The given series has 6terms. What is the sum of the terms of the series 10+25+40+...+85

A.) 285

B.) 365

C.) 350

D.) 325

Answer 1

A.) 285

Explanation:

The sum of an arithmetic series is the sum of the first and last terms multiplied by half the number of terms.

(10 +85)·6/2 = 285 . . . sum of 6 terms