Maths-
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Question

Number of rectangles in fig. shown which are not squares is

  1. 159
  2. 160
  3. 161
  4. None

The correct answer is: 160


    Total number of rectangles
    equals to the power of 7 C subscript 2 cross times to the power of 5 C subscript 2 minus No.of squares
    equals 210 minus No. of squares
    therefore Number of squares  equals 24 plus 15 plus 8 plus 3 equals 50
    not stretchy downwards arrow space of 1em not stretchy downwards arrow space of 1em not stretchy downwards arrow  not stretchy downwards arrow
    open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 1 cross times 1 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 2 cross times 2 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 3 cross times 3 end cell row cell text  area  end text end cell end table close parentheses open parentheses table attributes columnalign left columnspacing 1em end attributes row cell 4 cross times 4 end cell row cell text  area  end text end cell end table close parentheses

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