The CAS Registry Mumber 84184-18-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,1,8 and 4 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 84184-18: (7*8)+(6*4)+(5*1)+(4*8)+(3*4)+(2*1)+(1*8)=139 139 % 10 = 9 So 84184-18-9 is a valid CAS Registry Number.
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