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How many positive integers less than or equal to 100 are divisible by 2, 4 or 5?(a) 12.3(b) 87.2(c) 45.3(d) 78.2I have been asked this question during an online interview.My enquiry is from Addition Theorem on Probability in chapter Discrete Probability of Discrete Mathematics

Answer»

Right answer is (d) 78.2

To ELABORATE: To count the number of integers = \(\FRAC{100}{2} + \frac{100}{4} + \frac{100}{5} – \frac{100}{8} – \frac{100}{20} + \frac{100}{100}\)

= 50 + 25 + 20 – 12.8 – 5 + 1 = 78.2.



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