1.

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»

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



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