The CAS Registry Mumber 189371-40-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,3,7 and 1 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 189371-40: (8*1)+(7*8)+(6*9)+(5*3)+(4*7)+(3*1)+(2*4)+(1*0)=172 172 % 10 = 2 So 189371-40-2 is a valid CAS Registry Number.
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