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In an a.p if pth termis1/q …

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In an a.p if pth termis1/q and qth term is 1/p prove that the sum of first pq terms is 1/2×(pq+1) where p does not equal to q

    • Posted by Monu Chaudhary 7 years, 11 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Abhishek Kushwaha 7 years, 11 months ago

    1/q=a+(p_1)d ........ (1) 1/p=a+(q-1)d ........ (2) Sub 1and2 equ. 1/q-1/p=(p-q) d p-q/pq=(p-q) d 1/pq=d put the value of 'd' in equ. (1) we get 'a' =1/pq S=pq/2{2/pq+(pq-1)/pq} Solvetheabove equ. we get s=1/2(pq+1) Hence prove

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