The CAS Registry Mumber 82471-42-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,4,7 and 1 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 82471-42: (7*8)+(6*2)+(5*4)+(4*7)+(3*1)+(2*4)+(1*2)=129 129 % 10 = 9 So 82471-42-9 is a valid CAS Registry Number.
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