A club consists of 25 married couples. Determine how many ways a committee of 7 people can be formed from these couples if:

a) there are no restrictions (1 mark)

b) there are exactly 5 men on the committee (2 marks)

c) at least one person must be a man (2 marks)

d) there must be at least 3 women and at least 2 men (4 marks)

*Do not simplify your answers.