The CAS Registry Mumber 195459-31-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,4,5 and 9 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 195459-31: (8*1)+(7*9)+(6*5)+(5*4)+(4*5)+(3*9)+(2*3)+(1*1)=175 175 % 10 = 5 So 195459-31-5 is a valid CAS Registry Number.
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