10 (a) (i) Find how many 5-digit even numbers can be made using each of the digits 1, 2, 3, 4, 5 once
(ii) Find how many different 3-digit numbers can be made using the digits 1, 2, 3, 4, 5 if each
digit can be used once only. 
(b) A man and two women are to sit in a row of five empty chairs. Calculate the number of ways they
can be seated if
(i) the two women must sit next to each other, 
(ii) all three people must sit next to each other.