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Quantitative Aptitude

Highest Power of a Number

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Question

Find the total number of ways in which 4 people can take their places in a Bus having 10 seats?

A

40

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B

400

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C

2640

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D

5040

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Solution

The correct option is D 5040
$=^{10} P_{4} = 10 \times 9 \times 8 \times 7 = 5040$

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