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KEAM 2019 Math Paper
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© examsnet.com
Question : 61
Total: 121
If
n
(
A
)
=
61
,
n
(
B
)
=
95
,
n
(
A
−
B
)
=
25
, then
(
A
∪
B
)
is equal to
85
105
120
125
131
Validate
Solution:
n
(
A
)
=
n
(
A
−
B
)
+
n
(
A
∩
B
)
61
=
25
+
n
(
A
∩
B
)
∴
n
(
A
∩
B
)
=
36
n
(
A
∪
B
)
=
n
(
A
)
+
n
(
B
)
−
n
(
A
∩
B
)
=
61
+
95
−
36
=
120
© examsnet.com
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