The CAS Registry Mumber 89998-16-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,9,9 and 8 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 89998-16: (7*8)+(6*9)+(5*9)+(4*9)+(3*8)+(2*1)+(1*6)=223 223 % 10 = 3 So 89998-16-3 is a valid CAS Registry Number.
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