Question

Two numbers are selected randomly from the set S = {1, 2, 3, 4, 5, 6} one by one without replacement. The probability that minimum of the two numbers is less than 4 is

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

P(at least one of them < 4) = 1 – P(both are ≥ 4)

$=1-\frac{3}{6}\times \frac{2}{5}=1-\frac{1}{5}$

$=\frac{4}{5}$