Question

The sum of first five terms of an ap and the sum of

Answer 1

Answer:

First five term 1,2,3,4,5

a = 1

d = 1

Sn = n/2 { 2a + (n - 1 ) d}

S5 = 5/2 { 2 × 1 + ( 5 - 1 ) × 1 }

= 5/2 ( 2 + 4 )

= 5/2 × 6

= 5 × 3

= 15

Sum of 5 th term = 15