Class XII

In a box, there are 8 red, 7 blue and 6 green balls. One ball is picked up randomly. What is the probability that it is neither red nor green?
  1. 1 3
  2. 3 4
  3. 7 19
  4. 8 21
Three unbiased coins are tossed. What is the probability of getting at most two heads?
  1. 3 4
  2. 1 4
  3. 3 8
  4. 7 8
Two cards are drawn together from a pack of 52 cards. The probability that one is a spade and one is a heart, is:
  1. 3 20
  2. 29 34
  3. 47 100
  4. 13 102
Find the mean number of heads in three tosses of a fair coin.
  1. 1.2
  2. 1.0
  3. 1.5
  4. 1.4
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?
  1. 10 21
  2. 11 21
  3. 2 7
  4. 5 7
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