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Gyaan Maths
CBSE · Class 6-12
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Class 11 · Mathematics (041) · Unit 6: Permutations and Combinations
Combinations
Lesson 3 of 4
n
C
r
=
n
!
r
!
(
n
−
r
)
!
^nC_r = \dfrac{n!}{r!(n-r)!}
n
C
r
=
r
!
(
n
−
r
)!
n
!
. Selection (order doesn't matter).
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Permutations
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Applications
All lessons in this unit
1. Fundamental Principle of Counting
2. Permutations
3. Combinations
4. Applications