The GATE Grind

GATE Probability and Statistics: Counting, probability axioms, conditional probability and Bayes theorem – Previous Year Questions

9 GATE previous year questions on Counting, probability axioms, conditional probability and Bayes theorem (Probability and Statistics, Data Science and Artificial Intelligence) with answers and explanations, from every paper.

  1. GATE 2024 DA Q12 (1 mark, Multiple choice) – Three fair coins are tossed independently. T is the event that two or more tosses result in heads. S is the event that two or more tosses result in…
  2. GATE 2024 DA Q58 (2 marks, Numerical answer) – Consider two events T and S. Let T denote the complement of the event T. The probability associated with different events are given as follows: P(T) =…
  3. GATE 2025 DA Q31 (1 mark, Numerical answer) – There are three boxes containing white balls and black balls. Box-1 contains 2 black and 1 white balls. Box-2 contains 1 black and 2 white balls.…
  4. GATE 2025 DA Q45 (2 marks, Multiple choice) – A random experiment consists of throwing 100 fair dice, each die having six faces numbered 1 to 6. An event A represents the set of all outcomes where…
  5. GATE 2026 DA Q19 (1 mark, Multiple choice) – Let M be a randomly chosen non-empty subset of S = \1, 2, 3, , 2026\. Which of the following is the probability that the product of all the elements…
  6. GATE 2026 DA Q20 (1 mark, Multiple choice) – Suppose that a computer program provides a non-negative and integer-valued random solution to the equation n 1 + n 2 + n 3 + n 4 = 20. Which of the…
  7. GATE 2026 DA Q33 (1 mark, Numerical answer) – The number of bijections f() from the set S = \1, 2, 3, 4\ to itself such that f(f(n)) = n, for all n S, is . (*Answer in integer*)
  8. GATE 2026 DA Q57 (2 marks, Numerical answer) – A clinic specializes in testing for a disease D. The result of the test can be either positive or negative. A study revealed that if a person suffers…
  9. GATE 2026 DA Q64 (2 marks, Numerical answer) – Let A 5 5 be a matrix such that each of its elements follows Bernoulli(p = 0.50) distribution independently. The probability that the row-sum of the…