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The number of bijective function f(1,3,5...

The number of bijective function `f(1,3,5,7, . . .,99) to (2,4,6,8,. . . 100)` if `f(3) ge f(5) ge f(7) . . . ge f(99)` is :

A

`"^50C_1`

B

`"^50C_2`

C

`(50!)/2`

D

`"^50C_3 xx 3!`

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