Question Detail
Question
There are 6 letters and 3 post boxes. The number of ways in which these letters can be posted is:
Correct Answer
Option B is the correct answer.
Detailed Explanation
Each of the 6 letters can be posted into any one of the 3 post boxes. The choice for one letter is independent of the choices for other letters.For the first letter, there are 3 choices of post boxes.For the second letter, there are 3 choices of post boxes....For the sixth letter, there are 3 choices of post boxes.By the multiplication principle, the total number of ways is 3 × 3 × 3 × 3 × 3 × 3 = 36.
Hint
Consider the choices for each item (letter) independently and how many options are available for each choice (post boxes).