The CAS Registry Mumber 80020-74-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,0,2 and 0 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 80020-74: (7*8)+(6*0)+(5*0)+(4*2)+(3*0)+(2*7)+(1*4)=82 82 % 10 = 2 So 80020-74-2 is a valid CAS Registry Number.
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