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Class 11MathematicsPermutations and CombinationsCombinationsExpert
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How many rectangles are there in a grid of (5) rows and (4) columns of small rectangles?

Answer and explanation

Correct answer: (150)

Choosing two horizontal lines from (6) and two vertical lines from (5) gives ( \binom{6}{2}\binom{5}{2}=150 ). A rectangle needs two horizontal and two vertical lines.

Related tags

Class11CombinationsRectanglesGridExpertPermutations And CombinationsMathematicsClass 11 Mcq
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