Question

The sum of first 10 even natural numbers is ______.

विकल्प

• 120

• 110

• 65

• 120

Answer 1

The sum of first 10 even natural numbers is 110.

Explanation:

First 10 even natural numbers are : 2, 4, 6, 8, 10, .... upto 10 terms.

The above list is an A.P. with,

First term (a) = 2

Common difference (d) = 2

By formula,

Sum of n terms = `n/2​[2a + (n - 1)d]`

Substituting values we get:

= `10/2[2×2+(10−1)×2]`

= 5 × [4 + 9 × 2]

= 5 × [4 + 18]

= 5 × 22

= 110.