Math miscellaneousHard

Question

An experiment has 10 equally likely outcomes. Let A and B be two non-empty events of the experiment. If A consists of 4 outcomes, the number of outcomes that B must have so that A and B are independent, is

Options

A.2, 4 or 8
B.3, 6 or 9
C.4 or 8
D.5 or 10

Solution

P(A ∩ B) =
⇒   is an integer
⇒   p = 5 or 10.

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