The CAS Registry Mumber 31803-13-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,8,0 and 3 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 31803-13: (7*3)+(6*1)+(5*8)+(4*0)+(3*3)+(2*1)+(1*3)=81 81 % 10 = 1 So 31803-13-1 is a valid CAS Registry Number.
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