The CAS Registry Mumber 113739-31-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,7,3 and 9 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 113739-31: (8*1)+(7*1)+(6*3)+(5*7)+(4*3)+(3*9)+(2*3)+(1*1)=114 114 % 10 = 4 So 113739-31-4 is a valid CAS Registry Number.
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