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Which term of the AP: 121, …

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Which term of the AP: 121, 117, 113,......, is its firat negative term?[ *HINT* : Find n for 'an'<0]

Posted by Shabeeha Khadeeja 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Kamboj Ji 6 years, 10 months ago

Accprding to question, a=121 d=-4 So, a+(n-1)*d<0, 121+(n-1)*-4<0 121-4n+4<0, 125<4n, n>125/4, n>31*1'4, So its 32 term

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