KVPY SX SB Exam 19-Nov-2017 Question Paper

Question : 89 of 120

Marks: +1, -0

Suppose four balls labelled 1, 2, 3, 4 are randomly placed in boxes

B_1, B_2, B_3, B_4

. The probability that exactly one box is empty is

Solution:

required probability =

{^4C_1×4!/{(1!)×2!}×1/2!×3!}/4^4=9/16

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