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If nineth term of A. P. …

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If nineth term of A. P. is (2n+1)what is sum of its first three terms

Posted by Naman Sharma 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Aditi Shree 6 years, 10 months ago

2*1+1=3(n=1) 2*2+1=5(n=2) 2*3+1=7(n=3) Required AP:3,5,7.... Sum of first three terms :t1+t2+t3 3+5+7=15(ans.)

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