The CAS Registry Mumber 195189-19-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,1,8 and 9 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 195189-19: (8*1)+(7*9)+(6*5)+(5*1)+(4*8)+(3*9)+(2*1)+(1*9)=176 176 % 10 = 6 So 195189-19-6 is a valid CAS Registry Number.
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