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A rectangle with sides of lengths (2n-1...

A rectangle with sides of lengths `(2n-1) and (2m-1)` units is divided into squares of unit length. The number of rectangles which can be formed with sides of odd length, is (a) `m^2n^2` (b) `mn(m+1)(n+1)` (c) `4^(m+n-1)` (d) non of these

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