Which of the following is NOT a subset of the set of rational numbers?

Question

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Answer 1

rational numbers are numbers that can be represented in the form of
a/b where a & b are integers
so numbers line 0, 1 ,2, 3, 5, ...,-1,-2,-3,....
& 1/2 ,1/5 1/7 9/11 ,...(all fractions) are rational
but sqr(2) sqr(3), sqr(5) ,.., Pi , are not rational number
so d are not rational
{pi,22/7 sqr(13)14}

note that the following number are rational
{ sqr(16)sqr(121) -sqr(1)}
althougth they are square root but they are square of rational numbers sqr(16)=4 sqr(121)=11 sqr(1)=1

Answer 2

set 2 and 3

Answer 3

Just the 4th set is NOT. All the elements of the first 3 sets are equal to a ratio of integers so they are rational.