Question 5 [5 points] Suppose a box contains 5 balls coloured red, blue, green, yellow and white. Answer the following: a [1] In how many ways can you select 2 balls? b [1] In how many ways can you select 2 balls so that one of them is either red or white? c [1] In how many ways can you select 3 balls so that none of them are blue? d [1] If you are to arrange these balls in order from #1-5, how many arrangements are there so that the green ball is in position #4? e [1] If you are to arrange these balls in order from #1-5, how many arrangements are there so that the white ball comes right after the red ball?

Fig: 1