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 n (b) mn (m + 1)(n+1) (d) None of these (c) -n-1

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Number of ways of selecting verticle sides ( =1+3+5+ldots . .+(2 n-1)=n^{2} ) Number of ways of selecting horizontal sides ( =m^{2} ) ( therefore ) Number of rectangles ( =m^{2} n^{2} )

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