The CAS Registry Mumber 89813-31-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,8,1 and 3 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 89813-31: (7*8)+(6*9)+(5*8)+(4*1)+(3*3)+(2*3)+(1*1)=170 170 % 10 = 0 So 89813-31-0 is a valid CAS Registry Number.
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