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If `R` is a relation from a finite set A having `m` elements to a finite set B having `n` elements then the number of relations from A to B is `2^(m n)` b. `2^(m n)-1` c. `` . d. `m^n`

A

`2^(mn)`

B

`2^(mn)-1`

C

`2mn`

D

`m^(n)`

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