Maths-
General
Easy
Question
There is a rectangular sheet of dimension 
×
, (where 
. It has been divided into square of unit area by drawing lines perpendicular to the sides. Find number of rectangles having sides of odd unit length
The correct answer is:
Along horizontal side one unit can be taken in (2m–1) ways and 3 unit side can be taken in 
ways.
\ The number of ways of selecting a side horizontally is
Similarly the number of ways along vertical side is 
.
\Total number of rectangles
.
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