Question

In how many ways 3 letters can be posted in 4 letters boxes if all the letters are not posted in the same letter box?

विकल्प

• 63

• 60

• 77

• 81

Answer 1

60
Explanation:
The number of ways in which three letters can be posted in 4 letters boxes = 4³ = 64 but it includes the 4 ways in which all letters may be posted in the same box.
Hence, required number of ways = 64 - 4 = 60