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8. How many 4-digit number each lower than _?000 can you form from 5.6.18.9 and 3- (a) no repetition (b) repetition are allowed (c) How many of these are even (d) How many of these are odd. _ 9. ln how many ways can 4 boys and 5 girls all In a row. If boys and girls must alternate. _ 10- In a science club there are 8 females and 5 males. A committee 4 females and 3males is to be chosen. How many ways can the selection be done? 12. From 5 red,6_]green andB white balls, How many selection of ? balls are possible i 2 of each color are to be selected