WAEC - Mathematics (2005 - No. 30)
P = {3, 9, 11, 13} and Q = {3, 7, 9, 15} are subset of the universal set ξ = {1, 3, 7, 9, 11, 13, 15} find PI ∩ QI
{3, 9}
{5, 7, 9}
{1}
{1, 11}
คำอธิบาย
PI = {1, 7, 15} ; QI = {1, 13, 11}
PI ∩ QI = {1}
PI ∩ QI = {1}