The CAS Registry Mumber 131938-13-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,9,3 and 8 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 131938-13: (8*1)+(7*3)+(6*1)+(5*9)+(4*3)+(3*8)+(2*1)+(1*3)=121 121 % 10 = 1 So 131938-13-1 is a valid CAS Registry Number.
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