The CAS Registry Mumber 20814-03-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,1 and 4 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 20814-03: (7*2)+(6*0)+(5*8)+(4*1)+(3*4)+(2*0)+(1*3)=73 73 % 10 = 3 So 20814-03-3 is a valid CAS Registry Number.
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