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Which term of AP:121,117,113,........is first negative …

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Which term of AP:121,117,113,........is first negative term ?

    • Posted by Satyajit Sahoo 6 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Harsh Vardhan 6 years, 11 months ago

    Given,a=121 d=117-121 d=-4 An=0 An=a+(n-1)d 0=121+(n-1)-4 (n-1)-4=-121 (n-1)= -121/-4 n= -121/-4+1 n=121+4/4 n= 125/4 n=31.25 n=32 So,the first negative term is 32th term Verify, a32=121+31×-4 a32=121-124 a32=-3 And the first negative term is -3

    1Thank You

    Sahil Igalwar 6 years, 11 months ago

    A-125 (let, to get into negative, we need increase 1 term from April) D-117-121= -4 An<o a+(n-1) d <0 125+(n-1) -4 <0 (n-1) -4<-125 (n-1) < -125/-4 n-1 < 31 n<32 A32 will be the first negative term of given AP

    0Thank You

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