JEE Main 2020 Mathematics question
If 10 different balls are to be placed in 4 distinct boxes at random, then the probability that two of these boxes contain exactly 2 and 3 balls is -
Answer: (A)
Solution
The source shows the key as [1] (945/ with this counting: ⁴C₂ × (5!/(2!3!)) × 2! × ¹⁰C₅ × 2⁵ over 4¹⁰.