IF A={1,2,3….} and N is a set of natural numbers, then check whether A and N are equal?

2 is……………of set of natural numbers.

If X = {4^(n) - 3n - 1: n in N} " and " Y = {9(n-1): n in N} , where N is the set of natural numbers, then X cup Y is equal to

If the mean of first n natural numbers is 11 then n =

Check whether- 90+(-45) and (-90)+45 are Equal.

f: N to A where N is the set of natural numbers and A is the set of even natural numbers, defined by f(x) = 2x , then f is:

Check whether (-136)-:4 and 136-:(-4) are Equal.

Set of whole numbers -set of natural numbers ? (i.e W-N ={})

Consider the number 4^n where n is a natural number. Check whether there is any value of n which 4^n ends with the digit zero?