JEE Main 28 June 2022 Shift 1 Solved Paper

When n=1,5,9,13 then ‌

n+1

2

will give all odd numbers.
When n=3,7,11,15......
n−1 will be even but not divisible by 4
When n=2,4,6,8...
Then 2n will give all multiples of 4
So range will be N.
And no two values of n give same y, so function is one-one and onto.