The CAS Registry Mumber 951889-28-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,5,1,8,8 and 9 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 951889-28: (8*9)+(7*5)+(6*1)+(5*8)+(4*8)+(3*9)+(2*2)+(1*8)=224 224 % 10 = 4 So 951889-28-4 is a valid CAS Registry Number.
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