The CAS Registry Mumber 618383-18-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,1,8,3,8 and 3 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 618383-18: (8*6)+(7*1)+(6*8)+(5*3)+(4*8)+(3*3)+(2*1)+(1*8)=169 169 % 10 = 9 So 618383-18-9 is a valid CAS Registry Number.
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