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A number is chosen at random among the first 120 natural numbers. The probability of the number chosen being a multiple of 5 or 15 is?

1/5
1/8
1/6
None of these

Correct Answer: 1/5

Explanation:

∵ Total no. of favourable cases i,e., (5, 10, 15, 20, 25, 30, ....., 105, 110, 115, 120) = 24.
∴ Reqd . Prob = 24/120 = 1/5

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