In how many ways could you pick 3 workers to represent the company at a forum if there are 39 women and 56 men in the group and

a) no restrictions are made

b) there must be at least one of each gender

c) Ken and Laura would never work together as representatives

i think for a) the answer is 138415 as its nCr(95,3)

but im not sure about b or c, so if someone could give me a hand it would be greatly appreciated