The CAS Registry Mumber 57871-11-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,8,7 and 1 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 57871-11: (7*5)+(6*7)+(5*8)+(4*7)+(3*1)+(2*1)+(1*1)=151 151 % 10 = 1 So 57871-11-1 is a valid CAS Registry Number.
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