There are four parcels and five post-offices.
Question:

There are four parcels and five post-offices. In how many different ways can the parcels be sent by registered post?

Solution:

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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