The CAS Registry Mumber 71819-82-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,8,1 and 9 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 71819-82: (7*7)+(6*1)+(5*8)+(4*1)+(3*9)+(2*8)+(1*2)=144 144 % 10 = 4 So 71819-82-4 is a valid CAS Registry Number.
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