KVPY SX SB Exam 2012 Question Paper

Question : 1 of 120

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PART I

MATHEMATICS

Three children, each accompanied by a guardian, seek admission in a school. The principal wants to interview all the 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?

Validate

Solution:

6!/{(2!)^3}=90

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