An integer is chosen at random and squared. The probability that … - Vidyadip

MCQ

An integer is chosen at random and squared. The probability that the last digit of the square is $1$ or $5$ is

A
$\frac{2}{{10}}$
✓
$\frac{3}{{10}}$
C
$\frac{4}{{10}}$
D
$\frac{9}{{25}}$

✓

Answer

Correct option: B.

$\frac{3}{{10}}$

b
(b) The last digit of square will be $41$ or $5$ only

when the integer is $1, 5$ or $9$.

$\therefore$ Required probability $ = \frac{3}{{10}}$.

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