A bag contains 100 identical marble stones numbered from 1 to 100. What is the

Question

A bag contains 100 identical marble stones numbered from 1 to 100. What is the probability of drawing a marble having a number divisible by both 4 and 5?

Options:

A .

\frac{1}{25}

B .

\frac{2}{25}

C .

\frac{2}{20}

D .

\frac{1}{20}

Answer: Option D
:
D

Numbers divisible by 4 and 5 both = 20, 40, 60, 80, 100.

Hence P = $\frac{Favourable outcomes}{Total outcomes}$ = $\frac{5}{100}$ = $\frac{1}{20}$

= $\frac{1}{20}$

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