The CAS Registry Mumber 113131-58-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,1,3 and 1 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 113131-58: (8*1)+(7*1)+(6*3)+(5*1)+(4*3)+(3*1)+(2*5)+(1*8)=71 71 % 10 = 1 So 113131-58-1 is a valid CAS Registry Number.
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