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KVPY SX SB Exam 2012 Question Paper
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© examsnet.com
Question : 1
Total: 120
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?
60
90
120
180
Validate
Solution:
6
!
(
2
!
)
3
=
90
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