Three girls and three guy sit in a row. How many ways can they sit if all the guys want to sit together?
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Group the guys and assume it is a single guy.
Then we get $4$ persons in total and they can be arranged in $4!$ ways.
The $3$ guys among themselves can be arranged in $3!$ ways.
Totally, $4! \times 3!$ possible arrangements.
Kiran
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