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Home  >>  EAMCET  >>  Mathematics
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If N denotes the set of all positive integers and if $f: N \to N$ is defined by $f(n) =$ the sum of positive divisors of n then, $f(2^k.3),$ where k is a positive integers, is :

\[\begin {array} {1 1} (a)\;2^{k+1} -1 & \quad (b)\;2(2^{k+1}-1) \\ (c)\;3(2^{k+1}-1) & \quad (d)\;4(2^{k+1}-1) \end {array}\]

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1 Answer

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$(c)\;3(2^{k+1}-1)$
answered Feb 27, 2014 by meena.p
 

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