On random selection, the probability of getting a composite number among the numbers from 51 to 100.

A) 4/5

B) 1/5

C) 3/5

D) 2/5

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2 Answers

Correct option is: A) \(\frac{4}{5}\)

Total number of outcomes = 100 - 51 + 1 = 50.

Non - composite number from 51 to 100 are (53, 59, 61, 67, 71, 73, 79, 83, 89, 97).

\(\therefore\) Number of non-composite number from 51 to 100 is 10.

\(\therefore\) Number of composite number from 51 to 100 = 50 -10 = 40.

\(\therefore\) Probability of getting a composite number from 51 to 100 

\(\frac {Number\, of \,composite\, number \,from \,51 \,to \,100}{Total \, number \, from \, 51 \,to \,100}\) = \(\frac {40}{50} = \frac 45\)

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Correct option is: A) \(\frac{4}{5}\)

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