The CAS Registry Mumber 194781-66-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,4,7,8 and 1 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 194781-66: (8*1)+(7*9)+(6*4)+(5*7)+(4*8)+(3*1)+(2*6)+(1*6)=183 183 % 10 = 3 So 194781-66-3 is a valid CAS Registry Number.
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