Question

A={set of even prime numder}
B={x|7x-1=13}

Answer 1

Answer:

A = {2}

B = {2}

7x - 1 = 13

7(2) - 1 = 13

for 1:

7(1) - 1 = 6 not possible

for 3:

7(3) - 1

21 - 1 =20 not possible

So, 2 is the only one element of B