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In a layered network, one node is selected from (3) nodes of the first layer, one from (4) nodes of the second layer, and one from (5) nodes of the third layer. One specific pair between the first and second layers is blocked. How many valid paths are possible?

Answer and explanation

Correct answer: (55)

The first two layers have (3\times4-1=11) valid pairs, and the third layer has (5) choices. Subtract the blocked pair and then multiply.

Related tags

Permutations-And-CombinationsFundamental-PrincipleCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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