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Check Digit Verification of cas no

The CAS Registry Mumber 54965-40-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,9,6 and 5 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 54965-40:
151 % 10 = 1
So 54965-40-1 is a valid CAS Registry Number.
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