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Maths-

General

Easy

Question

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

159
160
161
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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