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From the (20) cells of a (4 \times 5) grid, (3) cells are to be selected. No two selected cells should be in the same row or the same column. How many selections are possible?

Answer and explanation

Correct answer: (240)

First choose (3) rows and (3) columns, then match them in (3!) ways. Matching is useful for row-column restrictions.

Related tags

Grid-CellsMatchingCombinationsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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