The CAS Registry Mumber 89919-23-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,9,1 and 9 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 89919-23: (7*8)+(6*9)+(5*9)+(4*1)+(3*9)+(2*2)+(1*3)=193 193 % 10 = 3 So 89919-23-3 is a valid CAS Registry Number.
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