chapter:ap and gp
10.Find the sum of first 22 terms of an AP in which d=7 and 22nd term is 149.
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Nth term of An A.P. =A+(N-1)D . Sum of N terms is N/2(2A+(N-1)D) => So sum of 22 terms =22/2*(2(9)+21(7) =11*(18+147)= 11*165=1815.
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