The CAS Registry Mumber 82803-97-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,8,0 and 3 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 82803-97: (7*8)+(6*2)+(5*8)+(4*0)+(3*3)+(2*9)+(1*7)=142 142 % 10 = 2 So 82803-97-2 is a valid CAS Registry Number.
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