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Which term of AP:121,117,113,........is first negative term? |
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Answer» 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=32So,the first negative term is 32th term Verify, a32=121+31×-4 a32=121-124 a32=-3And the first negative term is -3 A-125 (let, to get into negative, we need increase 1 term from April) D-117-121= -4An |
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