Atown council consists of 8 members including the mayor.
how many different committees of 4 can be chosen from this council?

You would use combination in this so it would be 8C4 because the order doesnt matter in this case.

so 8c4 = 8! = 8*7*6*5*4<- This is the
end of the
(8-4)!*(4!) (4!)*4*3*2*1 the factoral 4! that will cancelled out 4 on top which will leave 8*7*6 on top and 4*3*2*1 [ 8*7*6. ]

[ 4*3*2*1 ] on the bottom...which you will calcuate the result and simplify it if needed