perms and combs 3u cam qs (1 Viewer)

[xXnukerrrXx]

how to solve this?

ex 10e q22

In how many ways can a boat of 8 women be arranged if three women can only row on the bow side and two others can only row on the stroke side?

ans: 1728

 

[apollo1]

well you have 4 on stroke side and 4 on bow side.
first you arrange bow side: 4P3
then stroke side: 4P2
then the other 3 in any of the three remaining places: 3!

total = 4P3x4P2x3! = 1728