JAMB - Mathematics (1992 - No. 8)

If x = (all prime factors of 44) and y = (all prime factors of 60), the elements of X ∪ Y and X ∩ Y respectively are

(2, 4, 3, 5, 11) and (4)

(4, 3, 5, 11) and (3, 4)

(2, 5, 11) and (2)

(2, 3, 5, 11) and (2)

x = (all prime factors of 44) and y = (all prime factors of 60)

∴ x = (2, 11), y = (2, 3, 5)

X ∪ Y = (2, 3, 5, 11),

X ∩ Y = (2)