Question

If α and β are the pth term and qth term of an AP, then show that:-
The sum of the first (p+q) terms of the AP is
$\frac{1}{2} (p + q) ( \alpha + \beta + \frac{ \alpha - \beta }{p - q} )$

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Answer 1

answer is in attachment

Answer 2

Answer:

The pth term of an A.P. is a and qth term is b. Prove that sum of its (p+q) terms is

p+q2[a+b+a−bp−q]