1. Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability
that the ticket drawn has a number which is a multiple of 3 or 5?
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2. A bag contains 2 red, 3 green and 2 blue balls. Two balls are drawn at random. What is the
probability that none of the balls drawn is blue?
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3. A five-digit number is formed by using digits 1,2,3,4 and 5 without repetition. What
is the probability that the number is divisible by 4?
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C. 4/5 D. None of these
4. If the chance that a vessel arrives safely at a port is 9/10 then what is the chance
that out of 5 vessels expected at least 4 will arrive safely?
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A.
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B.
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C.
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D.
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