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A rectangle with sides (2m-1) and (2n -1...

A rectangle with sides (2m-1) and (2n -1) is divided into squares of unit length by drawing parallel lines as shown in the diagram, then the number of rectangles possible with odd side lengths is :

A

`(m+n-1)^2`

B

`4^(m+n-1)`

C

`m^2n^2`

D

`m(m+1)n(n+ 1).`

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