Christmas eve!

Discrete Mathematics Level 5

On the Christmas eve , Santa was in a hurry to distribute gifts so he asked the most innocent child in the country to help him in distributing the gifts .

The boy was given a task to distribute the gifts in the street of 10 small huts . He distributed the gifts randomly . At the end the Santa informed the boy that he had not distributed a single gift at its correct place.

In how many ways this can happen if the boy remembers one thing that the gift that he was to give in House no. 1 he has given it in the House no. 2 of the street.

This is part of my set : Fun is a Student's Right

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