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The number of permutation of the letters...

The number of permutation of the letters of the word 'ALLAHABAD' are:

A

`9!`

B

`(9!)/(2!)`

C

`(9!)/(4!2!)`

D

`(9!)/(2!2!)`

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JBD PUBLICATION-PERMUTATIONS AND COMBINATIONS-EXAMPLE
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  10. Show that (2n)!/n!=[1.3.5……………….(2n-1)]2^n.

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