The CAS Registry Mumber 194919-74-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,4,9,1 and 9 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 194919-74: (8*1)+(7*9)+(6*4)+(5*9)+(4*1)+(3*9)+(2*7)+(1*4)=189 189 % 10 = 9 So 194919-74-9 is a valid CAS Registry Number.
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