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प्रश्न
There are four parcels and five post-offices. In how many different ways can the parcels be sent by registered post?
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उत्तर
Number of ways of sending 1 parcel via registered post = 5
Number of ways of sending 4 parcels via registered post through 5 post offices = 5\[\times\]5\[\times\]5\[\times\]5 = 625
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