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Check Digit Verification of cas no

The CAS Registry Mumber 87404-25-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,4,0 and 4 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 87404-25:
139 % 10 = 9
So 87404-25-9 is a valid CAS Registry Number.
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