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Sum of first n terms of …

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Sum of first n terms of an ap is given by sn=2nsquare+3n find the 16th termof the ap

Posted by Uma Pal 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Esha Pal 6 years, 10 months ago

Apply the formula Sn=Sn- Sn-1

Khushboo Giri 6 years, 10 months ago

Sn=2n²+3n S1=2+3 a =5 S2=2×2²+3×2 a+a+d=14 2×5+d=14 d=14-10 d=4 A16=a+15d =5+15×4 =5+60 =65

Puja Sahoo? 6 years, 10 months ago

65........?

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