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Q 2423423341.     Groups each containing `3` boys are to be formed out of
`5` boys-`A, B,C, D` and E such that no one group contains
both `C` and `D` together. What is the maximum number
of such different groups?
IAS 2007 Prelims
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)