Given: We have 4 letters and 5 letter boxes
To Find: Number of ways of posting letters.
One letter can be posted in any of 5 letter boxes.
We have to assume that all the letters are different.
So for first letter i.e. , we have 5 ways
Total number of ways = 5 × 5 × 5 × 5 = 625
In 625 ways 4 letters can be posted in 5 letter boxes.
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