The CAS Registry Mumber 10-28-6 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 1 and 0 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 10-28: (4*1)+(3*0)+(2*2)+(1*8)=16 16 % 10 = 6 So 10-28-6 is a valid CAS Registry Number.
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