The CAS Registry Mumber 9081-28-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,8 and 1 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 9081-28: (6*9)+(5*0)+(4*8)+(3*1)+(2*2)+(1*8)=101 101 % 10 = 1 So 9081-28-1 is a valid CAS Registry Number.
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