# permutation and combination

• Jan 8th 2013, 05:07 AM
permutation and combination
here is the question: eight people sit in a minibus four on the sunny side and four on the shady side. if 2 people want to sit on opposite sides to each other and another 2 people want to sit on the shady side in how many ways can this be done ??
• Jan 8th 2013, 07:12 AM
Plato
Re: permutation and combination
Quote:

here is the question: eight people sit in a minibus four on the sunny side and four on the shady side. if 2 people want to sit on opposite sides to each other and another 2 people want to sit on the shady side in how many ways can this be done ??

I assume that there only eight seats. So there only $8$ ways to seat the couple opposite each other. WHY?

There are then $3\cdot 2$ ways to seat the other two people on the sunny side. Can you explain that?

How many seats remain and how many ways can they be occupied?
• Jan 8th 2013, 07:46 PM
Re: permutation and combination
how will u do it then?? that's the question
• Jan 9th 2013, 03:46 AM
Plato
Re: permutation and combination
Quote: