First slide

Theorems of probability

Question

Using {1, 2, 3, 4, 5} four digited numbers are formed without repetetion at random. The probability that the number is divisible by 4 is

Easy

A

$\frac{1}{5}$
B

$\frac{2}{5}$
C

$\frac{3}{5}$
D

$\frac{4}{5}$

Solution

$p (E) = \frac{4 . {}^{3}P_{2}}{{}^{5}P_{4}}$
The probability that the number is divisible by 4 is $\frac{1}{5}$

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