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Permutation: n Different Things Taken r at a Time

There are six...

Question

There are six students A,B,C,D,E,F.
In how many ways can a - committee of four be formed so as always to include C ?

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Solution

$^{5} C_{3} = \frac{5!}{3! .2!} = \frac{5 \times 4}{2} = 10.$

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Permutation: n Different Things Taken r at a Time

Standard XII Mathematics

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