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The number of ways in which n ties can b...

The number of ways in which n ties can be selected from a rack displaying 3n different ties, is

A

`(3n!)/(2n!)`

B

`3xxn!`

C

`(3n)!`

D

`(3!)/(n!2n!)`

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The correct Answer is:
D
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OBJECTIVE RD SHARMA ENGLISH-PERMUTATIONS AND COMBINATIONS-Chapter Test
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  4. There are n-points (ngt2) in each to two parallel lines. Every point o...

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  9. The total number of numbers greater than 100 and divisible by 5, that ...

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  11. Number of numbers greater than 24000 can be formed by using digits 1,2...

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