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8. A five digit code is valid if satisfies following congruence: 1 i * Xi = 0(mod 9), where x; are digits of the code.

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8. A five digit code is valid if satisfies following congruence: 1 i * Xi = 0(mod 9), where x; are digits of the code. Find the last digit (x5) of the code starting with digits 7813x5. Provide all supportive work. Your answer: xs

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