If F(n) denotes the set of all divisors of n except 1, what is the least value of y satisfying `[F(20)nnF(16)]subeF(y)`?

If F(n) is the set of all factors of 'n' excluding 1 and F(16) nn F(24) = F(x) , then find thevalue of x.

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

Let N denote the set of all non-negative integers and Z denote the set of all integers. The function f:ZtoN given by f(x)=|x| is:

Let X and Y be the sets of all positive divisors of 400 and 1000 respectively (including 1 and the number), Then , n(X nnY)=

Let f_n(x) be the n^(th) derivative of f(x).the least value of n so that f_n=f_(n+1) where f(x)=x^2+e^x is

A derivable function f : R^(+) rarr R satisfies the condition f(x) - f(y) ge log((x)/(y)) + x - y, AA x, y in R^(+) . If g denotes the derivative of f, then the value of the sum sum_(n=1)^(100) g((1)/(n)) is