The CAS Registry Mumber 57819-80-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,8,1 and 9 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 57819-80: (7*5)+(6*7)+(5*8)+(4*1)+(3*9)+(2*8)+(1*0)=164 164 % 10 = 4 So 57819-80-4 is a valid CAS Registry Number.
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