tolong bantu ya PAKE CARA TERIMA KASIH

a. P{1,2,3,4,5}
Q{-4,-3,-2,-1,0}
PnQ = tidak beririsan = saling bebas
n(PnQ) = 0
b. P{1,3,5,7}
Q{2,3,5,7}
PnQ = {3,5,7}
n(PnQ) = 3
c. P{b,u,n,d,a}
Q{i,b,u}
PnQ ={b,u}
n(PnQ) = 2