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Find the sum of first 51 …

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Find the sum of first 51 terms of an AP whose second term and third term are 14 and18 respectively

Posted by Account Deleted 8 months, 3 weeks ago

CBSE > Class 10 > Mathematics

2 answers

Naincy Agarwal 8 months, 2 weeks ago

sol a2=a+d=14 ➡️a=14-d. i a+2d=18 ➡️14-d+2d=18. From i ➡️d=4 Now put d=4 in I a=14-4 a=10 Now to find sum of first 51 term Sn=n/2(2a+{n-1}d) S51=51/2(2×10+{51-1}×4) S51=51/2(20+50×4) S51=51/2(20+220) S51=51/2×240 S51=51×120 S51=6120 So sum of first 51 term of an AP will be 6120 where a=10 and d=4

Rudra King 8 months, 3 weeks ago

5610

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