The CAS Registry Mumber 80931-31-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,9,3 and 1 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 80931-31: (7*8)+(6*0)+(5*9)+(4*3)+(3*1)+(2*3)+(1*1)=123 123 % 10 = 3 So 80931-31-3 is a valid CAS Registry Number.
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