1.

If N denotes the set of all positive integers and if : NtoN is defined by f(n)= the sum of positive divisors of n, then f(2^(k).3), where k is a positive integer, is

Answer»

`2^(k+1)-1`
`2(2^(k+1)-1)`
`3(2^(k+1)-1)`
`4(2^(k+1)-1)`

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