The CAS Registry Mumber 198-31-2 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,9 and 8 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 198-31: (5*1)+(4*9)+(3*8)+(2*3)+(1*1)=72 72 % 10 = 2 So 198-31-2 is a valid CAS Registry Number.
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