Question

If x is the set of all primes below and y is the set of all primes factor or 30 then is x - y = y - x

Answer 1

X={1,3,5,7,11............}

Y={2,3,5}

X-Y

{1,3,5,7,11.......} - {2,3,5}

={1,7,11,13,17.....}

Y-X

{2,3,5}-{1,3,5,7,11.....}

={2}

Answer 2

2 is the
answer. ............