Teaching UP PGT Mock Test Series 2024 Mathematics Permutations and Combinations Factorial and its Properties

If n+1Cr+1 ∶ nCr ∶ n-1Cr-1 = 11 ∶ 6 ∶ 3 , then (nr) is equal to:

1
20
2
30
3
40
4
50
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