The CAS Registry Mumber 446871-73-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,6,8,7 and 1 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 446871-73: (8*4)+(7*4)+(6*6)+(5*8)+(4*7)+(3*1)+(2*7)+(1*3)=184 184 % 10 = 4 So 446871-73-4 is a valid CAS Registry Number.
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