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Permutation: n Different Things Taken r at a Time

Two men enter...

Question

Two men enter a railway compartment having 6 seats unoccupied. In how many ways can they are seated?

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Solution

The first man can occupy the seat in 6 ways and now the second man has only 5 ways left for choosing a seat. Hence the number of ways for the two to occupy two seats is 6 x 5 = 30.

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Permutation: n Different Things Taken r at a Time

Standard XII Mathematics

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