if Sn denotes the sum of first n terms of an A.P., prove that S12=3(S8-S4).
Given that :
Sn is sum of first n terms of an A.P.
Let a be the first term and d be the common difference of the given A.P.
Then,
if Sn denotes the sum of first n terms of an A.P., prove that S12=3(S8-S4).
Given that :
Sn is sum of first n terms of an A.P.
Let a be the first term and d be the common difference of the given A.P.
Then,