Question

1. is this a valid upc? 0 55270 83995 9

Explanation:

Step1: List UPC digits

Digits: $0, 5, 5, 2, 7, 0, 8, 3, 9, 9, 5, 9$

Step2: Sum odd-positioned digits

Odd positions (1st,3rd,5th,7th,9th,11th): $0 + 5 + 7 + 8 + 9 + 5 = 34$

Step3: Multiply sum by 3

$34 \times 3 = 102$

Step4: Sum even-positioned digits

Even positions (2nd,4th,6th,8th,10th,12th): $5 + 2 + 0 + 3 + 9 + 9 = 28$

Step5: Add the two sums

$102 + 28 = 130$

Step6: Check divisibility by 10

$130$ is divisible by $10$.

Answer:

Yes, this is a valid UPC.