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Standard XI
Mathematics
Number of Elements in a Cartesian Product
Two finite se...
Question
Two finite sets have m and n elements. The number of elements in the power set of first is 48 more then the total number of elements in power set of the second set. Find m&n.
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Solution
Power set of set
1
is, P(set
1
)
=
2
m
Power set of set
2
is, P(set
2
)
=
2
n
By given condition,
2
m
=
48
+
2
n
∴
2
m
−
2
n
=
48
∴
2
m
−
2
n
=
64
−
16
∴
2
m
−
2
n
=
2
6
−
2
4
∴
m
=
6
and
n
=
4
.
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