A.P. =2,6,12....
a=2, d=4
Sn = n/2 [2*2+(n-1)*4]
=n/2*4n = 2n²
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A.P. =2,6,12....
a=2, d=4
Sn = n/2 [2*2+(n-1)*4]
=n/2*4n = 2n²