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?
Answer: D
Here, S = {1, 2, 3, 4, ...., 19, 20}.
Let E = event of getting a multiple of 3 or 5 = {3, 6 , 9, 12, 15, 18, 5, 10, 20}.
P(E) = n(E)/n(S) = 9/20.
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One card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is a face card (Jack, Queen and King only)?
Answer: B
Clearly, there are 52 cards, out of which there are 12 face cards.
P (getting a face card) = 12/52 = 3/13.
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The total events to throw three dice simultaneously is
Answer: D
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The probability of a leap year selected at random contain 53 Sunday is:
Answer: A
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A box has 6 black, 4 red, 2 white and 3 blue shirts. Find the probability of drawing 2 black shirts if they are picked randomly?
Answer: D
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The total number of events of throwing 10 coins simultaneously is
Answer: A
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If four coins are tossed, the probability of getting two heads and two tails is -.
Answer: A
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What is the probability of not picking a king if you choose randomly from a pack of 52 cards?
Answer: B
Since there are 4 kings in a deck of 52, the probability of drawing a king is 4/52 = 1/13.
Hence, the probability of not picking a king is 1 – 1/13 = 12/13.
(∵ For an event E, P (E) =1-P (not E)).
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In a drawer there are 5 black socks and 3 green socks. Two socks are picked randomly one after the other without replacement. What is the possibility that both the socks are black?
Answer: A
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The special rule of multiplication of probability, the events must be
Answer: B
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