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

1/25

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2/25

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2/20

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2/40

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Solution

The correct option is D
2/40

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

Hence, Probability = $\frac{Numbe of favourable outcomes}{Total number of outcomes}$ = $\frac{5}{100}$ = $\frac{1}{20}$

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