Maths-
General
Easy

Question

A rectangle with sides 2m -1, 2n - 1 is divided into squares of unit length by drawing parallel lines as shown in the diagram.

The number of rectangles with odd side length is

  1. left parenthesis m plus n plus 1 right parenthesis to the power of 2 end exponent    
  2. m n left parenthesis m plus 1 right parenthesis left parenthesis n plus 1 right parenthesis    
  3. m to the power of 2 end exponent n to the power of 2 end exponent    
  4. 4 to the power of m plus n minus 1 end exponent    

The correct answer is: m to the power of 2 end exponent n to the power of 2 end exponent

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