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  • Someone is asked to take a number from 1 to 100. The probability that it is a prime is (A) 1 by 5(B) 6 by 25 (C) 1 by 4 (D) 13 by 50

Someone is asked to take a number from 1 to 100. The probability that it is a prime is
(A) \frac{1}{5}                     (B) \frac{6}{25}                   (C) \frac{1}{4}                     (D) \frac{13}{50}

Answers (1)

Answer.      [C]
Solution.      Probability: probability means possibility. It is a branch of mathematics that deals with the occurrence of a random event. The value is expressed from zero to one.
Total number of cases = 100
prime number from 1 to 100 = 2, 3, 5, 7, 9, 11, 13, 17, 19,
23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 83, 89, 97
Total prime numbers from 1 to 100 = 25
Probability of getting prime number = \frac{prime\, no.\, from\, 1\, to\, 100}{Total\, number}

\\=\frac{25}{100}\\\\=\frac{1}{4}

 

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