The CAS Registry Mumber 195194-68-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,1,9 and 4 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 195194-68: (8*1)+(7*9)+(6*5)+(5*1)+(4*9)+(3*4)+(2*6)+(1*8)=174 174 % 10 = 4 So 195194-68-4 is a valid CAS Registry Number.
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