Question

Compute the sum of first 30 terms of the ap 3 8 13 18

Answer 1

Sum of first n terms of an AP: S =(n/2)[2a + (n- 1)d]

Given than n=30, a=3, d=5

Sum = 30/2[2*3+(30-1)*5]

Sum = 15[6+29*5]

Sum = 15[6+145]

Sum = 15*151

Sum = 2265

Answer