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The sum of first three term …

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The sum of first three term of gp is 39/10and their product is 1. The common ratio and the terms

    • Posted by Gaurav Sharma 7 years, 3 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Amrit Kaur 7 years, 3 months ago

    Let three terms of a.p be a/r,a,ar AtoQ a/r+a+ar=39/10 eq.1 Also a/r.a.ar=1 a^3=1 a=1 Now put this value of a in eq.1,we get 1/r+1+r=39/10 1+r+r^2/r=39/10 10+10r+10r^2=39r 10^2r+10r-39r+10=0 10^2r-29r+10r=0 10^2r-25r-4r+10=0 5r(2r-5)-2(2r-5)=0 (5r-2)(2r-5) r=2/5or5/2

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