U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}.
{x | x is a multiple of 2} union {x is a multiple of 9}
Ans:
Let A = {x | x is a multiple of 2}
A = set of all multiples of 2 in the set U = {2,4,6,8,10}
Let B = {x | x is a multiple of 9}
B = set of all multiples of 9 in the set U = {9}
A U B = set of all elements in A or B = {2,4,6,8,9,10}
:)