SOLUTION: Sn=n/2(2a +(n-1)d) a=2 and d=2

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Question 755216: Sn=n/2(2a +(n-1)d)
a=2 and d=2
Answer by dkppathak(439) About Me  (Show Source):
You can put this solution on YOUR website!
Sn=n/2(2a +(n-1)d) WHERE a=2 d=2
Sn=n/2(2x2 +(n-1)2)
=n/2(4+2n-2)
=n/2(2n+2)
n/2x2(n+1)
n(n+1)answer