Diketahui diagram Venn Berikut disamping ini.Tentukan : d. n(PnR)' e, n ((PnQ)UR)

Diketahui: P = {1,2,3,4,5,6} | Q = {3,5,6,7,8,9} | R = {4,5,6,9,10,11}
                  S = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15}
Ditanya: n(P∩R)' & n((P∩Q)∪R)
Jawab:
(P∩R) = {3,4,5}
(P∩R)' = {1,2,6,7,8,9,10,11,12,13,14,15}
n(P∩R)' = 12

(P∩Q) = {3,5,6}
((P∩Q)∪R) = {3,4,5,6,9,10,11}
n((P∩Q)∪R) = 7