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How many terms of the AP: …

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How many terms of the AP: 9, 17, 25, ... must be taken to give a sum of 636?

Posted by Priya Tomar 4 years, 5 months ago

CBSE > Class 10 > Mathematics

4 answers

Babita Mohanta 4 years, 5 months ago

12

Kanak Chauhan 4 years, 5 months ago

Term be 12 , -53/4 ..

Shiva Gowri 4 years, 5 months ago

12

Ayush Sharma 4 years, 5 months ago

S=n/2(2a+(n-1) d) 636n=n/2(2*9+(n-1) 8) 318n=n(18+8n-8) 318n=n(10+8n) 318n=10n+8n^2 318n-10n=8n^2

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