Question

if the first term of an ap is -5 and the common difference is 2, then find the sum of the first six terms

Answer 1

Step-by-step explanation:

a=-5

d=2

n=6

Sn=?

Sn=n/2[2a+(n-1)d]

Sn=6/2[2*-5+(6-1)2]

Sn=3[-10+5*2]

Sn=3[-10+10]

Sn=3*0

Sn=0