\( X \) is a three-digit number. The number formed by reversing the digits of \( X \) is 891 les...

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\( X \) is a three-digit number. The number formed by reversing the digits of \( X \) is 891 less than \( X \). Find its units digit.
(a) 0
(b) 1
(c) 2
(d) Cannot be determined
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