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The USPS sells money orders identified by an 11 –digit number x1, x2, …, x11. The...

The USPS sells money orders identified by an 11 –digit number x1, x2, …, x11. The first ten digits identifies the money order and the and x11 is a check digit that satisfies the following x11 = x1 + x2 + … + x10 mod 9. Is 66589332194 a valid money order number for the USPS?

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