Question

The first term of an AP is 2 and its last term is 12. The number of terms is given as 10. Find the sum of the terms of this AP.

• A. 10
• B. 120
• C. 700
• D. 70

Answer 1

The correct option is D

70

The sum of n terms of an AP is given by the formula $S_n=\left(\frac{n}{2}\right)(firstterm+lastterm)$

Given,

first term = 2

last term = 12

number of terms = 10

Substituting the given values in the equation, we get

$\therefore$$S_n=\frac{10}{2}$ (2+12)

$\Rightarrow$$S_n$= 5(2+12) = 70