Olympiad – Class X – Mathematics - Probability

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Question - 1

What is the probability of getting a prime number in a throw of a die?

  • A 2
  • B 1/2
  • C 3/2
  • D 6

Question - 2

What is the probability that a vowel selected at random in English alphabet is an "i"?

  • A 1/5
  • B 1/2
  • C 1/6
  • D 1

Question - 3

When two dice are thrown, what is the probability of always getting a number greater than 4 on the second dice?

  • A 1/6
  • B 1/3
  • C 1/36
  • D 1/2

Question - 4

What is the probability for a leap year to have 52 mondays and 53 sundays?

  • A 1/366
  • B 1/52
  • C 2/7
  • D 1/7

Question - 5

In a single throw of two dice, what is the probability of getting a sum of 10?

  • A 1/12
  • B 1/36
  • C 1/6
  • D 1/8

Question - 6

Three letters, to each of which corresponds an addressed envelope are placed in the envelopes at random. What is the probability that all letters are placed in the right envelopes?

  • A 1/3
  • B 1
  • C 1/6
  • D 0

Question - 7

From a normal pack of cards, a card is drawn at random. Find the probability of getting a jack or a king.

  • A 2/52
  • B 1/52
  • C 2/13
  • D 1/26

Question - 8

Two numbers are chosen from 1 to 5. What is the probability for the two numbers to be consecutive?

  • A 1/5
  • B 2/5
  • C 1/10
  • D 2/10

Question - 9

Two dice are thrown at a time. What is the probability that the difference of the numbers shown on the dice is 1?

  • A 5/18
  • B 1/36
  • C 1/6
  • D 1/12

Question - 10

A bag contains 3 white and 5 red balls. If a ball is drawn at random, what is the probability that it is red?

  • A 3/8
  • B 5/8
  • C 3/15
  • D 5/15
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