Question

How many numbers can is chosen at random from first one hundred natural numbers such that $\frac{(x - 20)(x - 40)}{x - 30} > 0$

• A. 19
• B. 9
• C. 28
• D. None of these

Answer 1

Answer: (C)

28

Answer 2

$\frac{(x - 20)(x - 40)}{(x - 30)} < 0$

Ž x < 20 or 30 < x < 40

Ž numbers 19 + 9 = 28.