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Permutations and Combinations
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Find the number of rectangles in the figure.
jeemain
math
class11
ch7
permutations-and-combinations
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medium
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asked
Aug 20, 2013
by
rvidyagovindarajan_1
retagged
Aug 6, 2014
by
sharmaaparna1
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1 Answer
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There are 5 vertical parallel lines and 4 horizontal parallel lines.
At a time two vertical lines and two horizontal lines are to be selected
to form a rectangle.
$\therefore$ No. of rectangles = $^5C_2.^4C_2$
$=10\times 6=60$
answered
Aug 20, 2013
by
rvidyagovindarajan_1
edited
Dec 20, 2013
by
meenakshi.p
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