Question

In AP Pth term q and Q th term p than P T the sum of P+Q is 1/2 (p+q)(p+q+1)

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

a+(p-1)d=q

a+(q-1)d=p

It implies d=-1, a=p+q-1

Sum of p+q terms =(p+q) /2[2a+(p+q-1)d

(p+q)/2[2(p+q-1)-(p+q-1)=(p+q)/2[p+q-1]