The CAS Registry Mumber 28155-28-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,1,5 and 5 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 28155-28: (7*2)+(6*8)+(5*1)+(4*5)+(3*5)+(2*2)+(1*8)=114 114 % 10 = 4 So 28155-28-4 is a valid CAS Registry Number.
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