The CAS Registry Mumber 195191-46-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,1,9 and 1 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 195191-46: (8*1)+(7*9)+(6*5)+(5*1)+(4*9)+(3*1)+(2*4)+(1*6)=159 159 % 10 = 9 So 195191-46-9 is a valid CAS Registry Number.
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