Statistics and Probability: JEE Main 2026 Mathematics question

JEE Main 2026 · 28 Jan, Morning shift · Q15

JEE Main 202628 Jan, Morning shiftMathematicsMediumStatistics and Probability258× since 2002

A bag contains 10 balls out of which

k

are red and

(10-k)

are black, where

0\le k\le10

. If three balls are drawn at random without replacement and all of them are found to be black, then the probability that the bag contains 1 red and 9 black balls is: