Want to ask us a question? Click here
Browse Questions
 Ad
0 votes

# 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 :

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

Can you answer this question?

## 1 Answer

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

0 votes
1 answer

0 votes
1 answer

0 votes
1 answer

0 votes
1 answer

0 votes
1 answer

0 votes
1 answer

0 votes
1 answer