A box contains 90 discs, numbered from 1 to ...

CBSE Class 10 Math 2023 All Sets Solved Paper

Question : 16 of 20

Marks: +1, -0

A box contains 90 discs, numbered from 1 to 90. If one disc is drawn at random from the box, the probability that it bears a prime number less than 23 is

$\; \frac{7}{90}$
$\; \frac{1}{9}$
$\; \frac{4}{45}$
$\; \frac{9}{89}$

Solution:

Prime number less than 23, are 1, 2, 3, 5, 7, 11, 13, 17, 19 = 8 number of possible outcomes

A box contains 90 discs, numbered from 1 to 90.

If one disc is drawn at random from the box, the probability that it bears a prime number less than 23, is

P = \; \frac{8}{90} = \; \frac{4}{45}

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