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In a grid, one moves from ((0,0)) to ((5,5)) using only right and up moves. The path must pass through exactly one of ((2,3)) and ((4,4)). How many paths are possible?

Answer and explanation

Correct answer: (120)

Subtract the paths passing through both points twice because exactly one point is required. Combine grid-path counting with inclusion-exclusion.

Related tags

Grid-PathsExactly-OneInclusion-ExclusionFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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