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PUNE MCA Exam 2017 Question Paper with answers for online practice

Question : 1 of 41

Marks: +1, -0

The number of multiples of 3 and 7 below 1000 is;

Solution:

Concept:

Multiples of both 3 and 7 are multiples of their LCM.

Explanation:

LCM of 3 and 7 is

21

Number of multiples of 21 below 1000 is

\left\lfloor \frac{999}{21} \right\rfloor = 47

Since 47 is less than 200.

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