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The UPC code, made up of numbers and dashes, on a video tape is 9-78094-11006-x. The digit x is in the 12th position. Let n be the value obtained by adding the digits in the odd positions, tripling that sum, and then adding the digits in the even positions. A valid UPC code is such that n is divisible by 10. For what value of x will this UPC code be valid?

 May 14, 2022
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nvm solved it by the way the answer is 9

 May 14, 2022

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