The CAS Registry Mumber 31017-83-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,0,1 and 7 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 31017-83: (7*3)+(6*1)+(5*0)+(4*1)+(3*7)+(2*8)+(1*3)=71 71 % 10 = 1 So 31017-83-1 is a valid CAS Registry Number.
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