Question

There are 2 locks on the door and the keys are among the six different ones you carry in your pocket. In a hurry you dropped one somewhere.The probability that you can still open the door is

• A. $\frac{1}{2}$
• B. $\frac{1}{3}$
• C. $\frac{2}{3}$
• D. $\frac{1}{4}$

Answer 1

Answer: (C)

$\frac{2}{3}$

$P$(correct key is lost) $=\frac{2}{6}$

$P$ required $=1-\frac{2}{6}=\frac{2}{3}$