Concept drill
urn-model
GATE CSE & IT · Probability & Counting · 2021-2026
2
PYQs
100%
keyed
1
elite explanations
2
years appeared
Study anchor
Rosen — Discrete Mathematics and Its Applications
Discrete structures, counting, relations, graph theory
Practice action
Start latest PYQPYQs in this concept
All concepts →2026 PYQ
An urn contains one red ball and one blue ball. At each step, a ball is picked uniformly at random from the urn, and this ball together with another ball of the same color is put b...
easyanswer keyelite explanation
2021 PYQ
A bag has r red balls and b black balls. All balls are identical except for their colours. In a trial, a ball is randomly drawn from the bag, its colour is noted and the ball is pl...
mediumanswer keybasic explanation