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" In an "AP" if "a=1,a(n)=20" and "S(n)=...

" In an "AP" if "a=1,a_(n)=20" and "S_(n)=399," then "n" is "

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In an A.P., if a = 1 , a_(n) = 20 and S_(n) = 399 , then n = ……..

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