tolong bantu ya.... no:10-12

no. 11 = A . 1,2,3,5,7 , B.(4,5,6,7,9)
B-A= (4,6,9)

10.

V = {2,3,5,7,11,13,17,19}
W = {1,3,5,7,9,11,13,15,17,19}
V U W = {1,2,3,5,7,9,11,13,15,17,19}
n (V U W) = 11

11.

A = {1,2,3,5,7}
B = {4,5,6,7,9}
B - A = {4,6,9}

12.

B = {0,1,2,3,4,5,6,7,8}
A = {1,3,5,7,9,11}
A - B = {9,11}
n(A - B) = 2

Semoga membantu:) maaf kalau salah