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A is a set containing n(1) elements and ...

A is a set containing `n_(1)` elements and B is another set containing `n_(2)` elements, The number of non -decreasing functions from `A rightarrow B` is

A

`(n_(1)+n_(2-1))C_(n_(1))`

B

`(n_(1)+n_(2-1))C_(n_(2))`

C

`n^(1)C_(n_(2))`

D

`n^(2)C_(n_(1))`

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