The CAS Registry Mumber 10-12-8 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 1 and 0 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 10-12: (4*1)+(3*0)+(2*1)+(1*2)=8 8 % 10 = 8 So 10-12-8 is a valid CAS Registry Number.
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