The CAS Registry Mumber 84696-18-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,6,9 and 6 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 84696-18: (7*8)+(6*4)+(5*6)+(4*9)+(3*6)+(2*1)+(1*8)=174 174 % 10 = 4 So 84696-18-4 is a valid CAS Registry Number.
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