Quantitative Aptitude - Probability

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Question - 1

In a simultaneous throw of two coins, the probability of getting at least one head is :

  • A \(1 \over 2\)
  • B ​\(1 \over 3\)​
  • C ​\(2 \over 3\)​
  • D ​\(3 \over 4\)​

Question - 2

Three unbiased coins are tossed. What is the probability of getting at least 2 heads ?

  • A ​\(1 \over 4\)​
  • B ​\(1 \over 2\)​
  • C ​\(1 \over 3\)​
  • D ​\(1 \over 8\)​

Question - 3

Three unbiased coins are tossed. What is the probability of getting at most two heads ?

  • A ​\(3 \over 4\)​
  • B ​\(1 \over 4\)​
  • C ​\(3 \over 8\)​
  • D ​\(1 \over 8\)​

Question - 4

In a single throw of a die, what is the probability of getting a number greater than 4 ?

  • A ​\(1 \over 2\)​
  • B ​\(1 \over 3\)​
  • C ​\(2 \over 3\)​
  • D ​\(1 \over 4\)​

Question - 5

In a simultaneous throw of two dice, that is the probability of getting a total of 7 ?

  • A ​\(1 \over 6\)​
  • B ​\(1 \over 4\)​
  • C ​\(2 \over 3\)​
  • D ​\(3 \over 4\)​

Question - 6

What is the probability of getting a sum 9 from two throws of a dice ?

  • A ​\(1 \over 6\)​
  • B ​\(1 \over 8\)​
  • C ​\(1 \over 9\)​
  • D ​\(1 \over 12\)​

Question - 7

In a simultaneous throw of two dice, what is the probability of getting a doublet ?

  • A ​\(1 \over 6\)​
  • B ​\(1 \over 4\)​
  • C ​\(2 \over 3\)​
  • D ​\(3 \over 7\)​

Question - 8

In a simultaneous throw of two dice, What is the provavility of getting a total of 10 or 11 ?

  • A ​\(1 \over 4\)​
  • B ​\(1 \over 6\)​
  • C ​\(7 \over 12\)​
  • D ​\(5 \over 36\)​

Question - 9

Two dice are thrown simultaneously. What is the probability of getting two numbers whose product is even ?

  • A ​\(1 \over 2\)​
  • B ​\(3 \over 4\)​
  • C ​\(3 \over 8\)​
  • D ​\(5 \over 16\)​

Question - 10

Tickets numbered 1 to 20 are mixed up and then a ticket is drawn at random. What is the probability that the ticket drawn bears a number which is a multiple of 3 ?

  • A ​\(3 \over 10\)​
  • B ​\(3 \over 20\)​
  • C ​\(2 \over 5\)​
  • D ​\(1 \over 2\)​