Vasily Petrov is completing an English assignment. In this assignment, there are 10 English expressions and their Russian translations in random order. The task is to establish the correct correspondences between the expressions and their translations. 1 point is given for each correctly established correspondence. Thus, one can score from 0 to 10 points. Vasya knows nothing, so he chooses the options at random. Find the probability that he will score exactly 9 points.

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If nine correct answers are guessed, then the tenth answer will also be correct. Therefore, the sought probability is zero.

## Answer

0.