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Permutation, Combination and Probability - Set 3
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NUST Entrance Test
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Mathematics
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Permutation, Combination and Probability
Set 3
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Mashaal Masha
Sep 30, 2022
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Choose the correct options for the following questions.
If $^{2n}C_{3}:^{n}C_{2}=11:1$ then n=
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Difficulty: Easy
A:
10
B:
11
C:
13
D:
1
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$^{n}C_{r}+2^{n}C_{r-1}+^{n}C_{r-2}$=
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Difficulty: Easy
A:
$^{n+1}C_{r}$
B:
$^{n-1}C_{r}$
C:
$^{n+2}C_{r}$
D:
$^{n-2}C_{r-1}$
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