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Q. Three ladies have each brought a child for admission to a school. The head of the school wishes to interview the six people one by one, taking care that no child is interviewed before its mother. The number of ways of doing this is (A) 6 (B) 36 (C) 72 (D)90

Q. Three ladies have each brought a child for admission to a school. The head of the school wishes to
interview the six people one by one, taking care that no child is interviewed before its mother. The
number of ways of doing this is
(A) 6 (B) 36 (C) 72 (D)90

Grade:11

2 Answers

Ramesh V
70 Points
11 years ago

Let tha people be L1S1L2S2L3S3

each son comes after his mother

taking son,mother as set , there are 3 sets whihc can be arranged in 3! ways

answer : 6 ways

--

regards

Ramesh

rajat agarwal
23 Points
11 years ago

but answer is 90 ways

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