Committees of 5 individuals are to be formed from 8.
a) How many committees are there?
b) How many committees of 5 can be formed from 8, given that two particular individuals are to be included on the committee?
c) How many committees of 5 can be formed from 8, given that two particular individuals are to be excluded from the committee?
d) How many committees of 5 can be formed from 8, given that at least one of two particular individuals is to be on the committee?