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Question: The no. of ways in which 10 persons of different heights can stand in a row so that the tallest and ...

The no. of ways in which 10 persons of different heights can stand in a row so that the tallest and shortest are together is

A

∠10‾/2\angle\underline{10}/2

B

2∠9

C

2∠10‾2\angle\underline{10}

D

∠9/2\angle 9/2

Answer

2∠9

Explanation

Solution

Consider the tallest shortest persons as one person. Then 9 persons can stand in ∠9 ways and the two particular persons can be interchanged in 2 ways. Hence 2∠9 ways.