Given that A and B are sets such that n(A) = 8, n(B)=12 and n(AnB) =3, find n(AuB).
A
15
B
17
C
20
D
23
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
n(AuB) = n(A) + n(B) - n(AnB)
n(AuB) = 8 + 12 - 3
= 17
Source: WAEC / JAMB / NECO Classroom Archive (Record #64431)