The CAS Registry Mumber 190793-18-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,0,7,9 and 3 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 190793-18: (8*1)+(7*9)+(6*0)+(5*7)+(4*9)+(3*3)+(2*1)+(1*8)=161 161 % 10 = 1 So 190793-18-1 is a valid CAS Registry Number.
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