Question

Find the sum of the first 10 ap 2,7,12,17

Answer 1

STEP BY STEP EXPLANATION :

SERIES : 2 , 7 , 12 , 17 .......

First term (a) = 2

Common difference (d) = 7 - 2 = 5

<<S = n / 2 ( 2a + ( n - 1 ) d )>>

Note : n = number of terms till which the sum is to be calculated

S = 10 / 2 ( 2 * 2 + ( 10 - 1 ) 5 )

S = 10 / 2 ( 4 + 45 )

S = 10 / 2 ( 49 )

S = 5 ( 49 )

S = 245