The CAS Registry Mumber 4815-42-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,8,1 and 5 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 4815-42: (6*4)+(5*8)+(4*1)+(3*5)+(2*4)+(1*2)=93 93 % 10 = 3 So 4815-42-3 is a valid CAS Registry Number.
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