Please help me with the following problem. Thank you in advance!

4)

(a) Determine the generating function for the number h, of bags of fruit of apples, oranges, watermelons, bananas, and pears in which there are an even number of apples, at least three oranges (three is included), at most two watermelons (two is included), a multiple of three number of bananas, and at most one pear. (b) Find a formula for h, from the generating function