The CAS Registry Mumber 183663-73-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,3,6,6 and 3 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 183663-73: (8*1)+(7*8)+(6*3)+(5*6)+(4*6)+(3*3)+(2*7)+(1*3)=162 162 % 10 = 2 So 183663-73-2 is a valid CAS Registry Number.
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