Question

Two numbers P and Q are selected from Set {1,2,3,.....,100\,then find the probability of P.Q is divisible by 5.}

• A. \(\frac{189}{495}\)
• B. \(\frac{79}{495}\)
• C. \(\frac{179}{495}\)
• D. \(\frac{9}{495}\)

Hint:

Whenever a question asks for "at least one" condition to be met (like product divisible by a prime meaning at least one factor is divisible), calculating the probability of the opposite event (none) is usually much simpler.

Answer 1

The Correct Option is C