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Byju's Answer
Standard IX
Mathematics
Inverse of a Function
n C r ÷ n C r...
Question
n
C
r
÷
n
C
r
−
1
=
[MP PET 1984]
A
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B
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C
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D
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Solution
The correct option is
C
On simplifying you will get
n
−
r
+
1
r
.