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प्रश्न
Find the number of ways in which 5 letters can be posted in 3 post boxes if any number of letters can be posted in a post box.
बेरीज
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उत्तर
There are 5 letters and 3 post boxes and any number of letters can be posted in all of three post boxes.
∴ Each letter can be posted in 3 ways.
∴ Total number of ways 5 letters can be posted
= 3 × 3 × 3 × 3 × 3
= 243
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