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23 Feb 2021, 09:00
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
89% (01:37) correct
11%
(01:59)
wrong
based on 61
sessions
History
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Not Attempted Yet
From the integers from 2 to 40 inclusive, one integer is selected at random. What is the probability that it is a perfect square or a prime ?
A. 17/39
B. 4/13
C. 3/13
D. 5/39
E. 4/39
Are You Up For the Challenge: 700 Level Questions: 700 Level Questions
A. 17/39
B. 4/13
C. 3/13
D. 5/39
E. 4/39
Are You Up For the Challenge: 700 Level Questions: 700 Level Questions
23 Feb 2021, 09:12
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Bunuel
Explanation:
total no of perfect squares from 2 to 40= 5
total no of primes from 2 to 40= 12
probability that a selected integer from 2 to 40 is a perfect square or a prime=(12+5)/39
=17/39
Hence A is the correct answer IMO.
23 Feb 2021, 09:22
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Given: From the integers from 2 to 40 inclusive, one integer is selected at random.
Asked: What is the probability that it is a perfect square or a prime ?
Total integers from 2 to 40 inclusive = 40 -2 + 1 = 39
Integers from 2 to 40 inclusive which are perfect square or a prime = {2,3,4,5,7,9,11,13,16,17,19,23,25,29,31,36,37} : 17 numbers
Probability = Favorable / Total = 17/39
IMO A
Asked: What is the probability that it is a perfect square or a prime ?
Total integers from 2 to 40 inclusive = 40 -2 + 1 = 39
Integers from 2 to 40 inclusive which are perfect square or a prime = {2,3,4,5,7,9,11,13,16,17,19,23,25,29,31,36,37} : 17 numbers
Probability = Favorable / Total = 17/39
IMO A
