Math Problem Help Decoding Universal Product codes ?

Math Problem Help Decoding Universal Product codes ?

4.The fifth digit of the UPC given below was rubbed off. Write and simplify an algebraic expression that you could use to determine what the fifth digit is. What is the fifth digit? Explain how you obtained your answer.0 252?5 04658 2

to find the pattern add the numbers in the odd number positions then multiply by 3 next add the number in even positions then add the results to the first 2 steps finally subtract the result of the third step from the next highest multiple of 10

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