if sn denotes the sum of first n trems of an ap, prove that s12=3(s8-s4)
Given, a and d are the first term and common difference of the A.P.
Sum of n term of the A.P,
Now,
Now, (1) = (2)
[Hence proved]
if sn denotes the sum of first n trems of an ap, prove that s12=3(s8-s4)
Given, a and d are the first term and common difference of the A.P.
Sum of n term of the A.P,
Now,
Now, (1) = (2)
[Hence proved]