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Which term of an AP: 21; …

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Which term of an AP: 21; 18; 15;....... is -81?

Posted by Prachi Malik 6 years, 11 months ago

CBSE > Class 10 > Mathematics

1 answers

Ashu Singh Sisodiya 6 years, 11 months ago

formula is = a+(n-1)×d -81=21+(n-1)×(-3) -81=21+(n-1)×(-3) -81=21-3n+3 -81=24-3n -81-24=-3n -105=-3n 105=3n 105÷3=n 35=n

3Thank You

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