Question

Find the sum of first 20 term of an ap 3,8,13------ using formula

Answer 1

Step-by-step explanation:

Given : 20 th Term Ap 3,8,13

Find : Sum Of First 20 Term

Solution :

Now Applying Formula

T^A = a + ( n - 1 ) d

n = 20 a = 3

d = T^ 1 - T^2

d = 8 - 3

d = 5

T^20 = 3 + ( 20 - 1 ) 5

T^20 = 3 + 19 × 5

T^20 = 98

The Answer Is 98