If f:N N, x_2>x_1 f(x_2)>f(x_1) x_1,x_2 N and f(f(n))=3n, n N, then f(2)=

JEE Main Mathematics question

If , and , , then

Answer: 3

is strictly increasing on and . If then , so . Since

Create a free account to read the complete working, and practise questions like this in a timed test.

Question ID VK-007523