Question

First term and commen difference of an a,p are 6 and 3 find the sum of first 27 terms of a.p

Answer 1

Answer:

Step-by-step explanation:

a=6

d=3

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

   =27/2*(12+26*3)

   =27*2*90

    =27*45

    =1215