What is the probability than an integer selected at random from those between 20 and 100 inclusive is a multiple of 15?

A 5/79

B 2/27

C 5/81

D 679

Solution

Correct Answer: Option C

20 থেকে 100 পর্যন্ত সংখ্যা =(100-20)+1
                                         =80+1=81 টি
এবং এদের মধ্যে 15 দ্বারা বিভাজ্য সংখ্যা =81/15
                                                                        5

নির্ণেয় সম্ভাবতা 5/81

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