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Which term of the Ap:121,117,113,....,is its …

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Which term of the Ap:121,117,113,....,is its first negative term?

Posted by Nini Ti 4 years, 3 months ago

CBSE > Class 10 > Mathematics

2 answers

Ashutosh Soni Ashu Soni 4 years, 3 months ago

32

Sweta Kumari 4 years, 3 months ago

a=121, d=-4 Tn<0 a+(n-1)×d <0 121+(n-1)×(-4) <0 121-4n+4 <0 125-4n <0 125<4n 4n>125 n= 31.25 Hence n= 32

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