The CAS Registry Mumber 4908-89-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,0 and 8 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 4908-89: (6*4)+(5*9)+(4*0)+(3*8)+(2*8)+(1*9)=118 118 % 10 = 8 So 4908-89-8 is a valid CAS Registry Number.
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