Permutation and Combination Relation (Jee Mains) | ExamDuo
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Permutations
Medium
Permutation and Combination Relation
If
n
P
r
=
n
P
r
+
1
and
n
C
r
=
n
C
r
−
1
, then the value of
r
is equal to:
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SELECT ONE OPTION
A
1
B
4
C
2
D
3
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