The CAS Registry Mumber 28767-62-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,7,6 and 7 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 28767-62: (7*2)+(6*8)+(5*7)+(4*6)+(3*7)+(2*6)+(1*2)=156 156 % 10 = 6 So 28767-62-6 is a valid CAS Registry Number.
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