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Mathematics
Mathematics
Problem
If
n
(
U
)
=
50
n(U) = 50
n
(
U
)
=
50
,
n
(
A
)
=
30
n(A) = 30
n
(
A
)
=
30
,
n
(
A
∩
B
)
=
12
n(A \cap B) = 12
n
(
A
∩
B
)
=
12
and
n
(
(
A
∪
B
)
′
)
=
15
n((A \cup B)') = 15
n
((
A
∪
B
)
′
)
=
15
, then find a.
n
(
B
)
n(B)
n
(
B
)
b.
n
(
B
−
A
)
n(B - A)
n
(
B
−
A
)
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