Answer :
Answer:
We need to find
n
(
A
′
∩
B
′
)
n
(
A
′
∩
B
′
)
=
n
(
U
)
−
n
(
A
∪
B
)
....(i)
Now
n
(
A
∪
B
)
=
n
(
A
)
+
n
(
B
)
−
n
(
A
∩
B
)
n
(
A
∪
B
)
=
400
Put in equation (i), we get
n
(
A
′
∩
B
′
)
=
700
−
400
=
300
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Answer:
We need to find
n
(
A
′
∩
B
′
)
n
(
A
′
∩
B
′
)
=
n
(
U
)
−
n
(
A
∪
B
)
....(i)
Now
n
(
A
∪
B
)
=
n
(
A
)
+
n
(
B
)
−
n
(
A
∩
B
)
n
(
A
∪
B
)
=
400
Put in equation (i), we get
n
(
A
′
∩
B
′
)
=
700
−
400
=
300
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