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For a sequence, if Sn=5n-2n2n, then its fourth term is

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Important Questions on Sequences and Series

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If the sum of an infinite GP be 9 and sum of first two terms be 5 then their common ratio is …..
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The sum of the first 10 terms of the series 9+99+999+.. is
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If 2+4+6+8 . . . . . . . . upto n terms1+3+5+7 . . . . . . . . upto n terms=3736, then n=