The CAS Registry Mumber 1313712-71-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,1,3,7,1 and 2 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1313712-71: (9*1)+(8*3)+(7*1)+(6*3)+(5*7)+(4*1)+(3*2)+(2*7)+(1*1)=118 118 % 10 = 8 So 1313712-71-8 is a valid CAS Registry Number.
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