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Fundamental Laws of Logarithms

Two persons e...

Question

Two persons entered a Railway compartment in which 7 seats were vacant. The number of ways in which they can be seated is

A

30

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B

42

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C

720

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D

360

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Solution

The correct option is B 42
The number of ways in which they can be seated = $^{7} P_{2} = 7 \times 6 = 42$

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