HomeBrowseBy SubjectTrendsDeep InsightsInsightsAbout
Start free trial
Home / Probability / Chronology

Probability

12 PYQ across 3 exams · 2015–2026 — the complete chronological timeline of how UPSC has tested this idea, oldest to newest.

EPFO 2015 → CAPF 2016 → ESE 2022
20151 PYQ
EPFOQ65
There are four identically sized and shaped balls in a box, with only its top open. Each ball is of a different colour, these being : Green,…
20161 PYQ
CAPFQ57
There are two boxes. Box I contains one white card and two black cards and Box II contains one white card and a black card. Two persons P an…
20222 PYQs
CAPFQ43
A coin is tossed 3 times. The probability of getting exactly 2 heads is…
ESEQ77
A batch of 100 capacitors contains 73 which are within the required tolerance values, 17 which are •b elow the required tolerance values, an…
20231 PYQ
CAPFQ78
Directions : The next three items are based on a survey on occurrence of vowels in a certain book irrespective of whether they are in upper …
20241 PYQ
ESEQ2
Suppose that 0·1% of the people in a certain area have a disease D and that a mass screening test is used to detect cases. The test gives ei…
20251 PYQ
EPFOQ80
Two unbiased dice, each marked 1 to 6 on their faces, are rolled simultaneously. What is the probability that the sum of the outcomes on the…
20265 PYQs
ESEQ61
What is the expectation of the number of failures preceding the first success in an infinite series of independent trials with constant prob…
ESEQ62
A deck of n numbered cards is thoroughly shuffled and the cards are inserted into n numbered cells one by one. If the card number i falls in…
ESEQ63
Let X1 and X2 be two independent random variables having variances k and 4 respectively. If the variance of Y = 3X2 − X1 is 49, then what is…
ESEQ64
What is the value of P(X + Y < 1/2) for the joint probability density function of X and Y f(x, y) = 3(x + y); 0 ≤ x ≤ 1, 0 ≤ y ≤ 1; 0 ≤ x + …
ESEQ67
An unbiased coin is thrown n times. It is desired that the relative frequency of the appearance of heads should lie between 0·49 and 0·51. W…
← Back to Probability
CrispUPSC · YouTube · Telegram · About · What’s New · invite-only beta
💬 Feedback

Send feedback