Paper 6 October/November 2008 MATHEMATICH (9709/6) A Levels
لطفا برای اطمینان از عملکرد و تجربه بهتر از مرورگرهای مدرن و به روز مانند کروم یا فایرفاکس استفاده کنید.

Bag $A$ contains 4 balls numbered 2, 4, 5, 8. Bag $B$ contains 5 balls numbered 1, 3, 6, 8, 8. Bag $C$ contains 7 balls numbered 2, 7, 8, 8, 8, 8, 9. One ball is selected at random from each bag.
a) Find the probability that exactly two of the selected balls have the same number.
b) Given that exactly two of the selected balls have the same number, find the probability that they are both numbered 2.
c) Event $X$ is ‘exactly two of the…