The CAS Registry Mumber 180893-97-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,0,8,9 and 3 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 180893-97: (8*1)+(7*8)+(6*0)+(5*8)+(4*9)+(3*3)+(2*9)+(1*7)=174 174 % 10 = 4 So 180893-97-4 is a valid CAS Registry Number.
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