# Chapter 10 - Test - Page 1127: 21

$10000$

#### Work Step by Step

It has been seen that the first three digits are locked in place. So, for the last $4$ digits, we ave $10$ choices each for each of those $4$ spaces. That is, $1\cdot 10 \cdot 10 \cdot 10 \cdot 10 =10000$

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