Permutations and Combinations-Fundamental Principle of Counting (KVPY Stream-SB-SX Math): Questions 1 - 1 of 1
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Question number: 1
» Permutations and Combinations » Fundamental Principle of Counting
Appeared in Year: 2012
Three children, each accompanied by a guardian, seek admission in a school. The principal wants to interview all 6 persons one after the other subject to the condition that no child is interviewed before its guardian. In how many ways can this be done?