The CAS Registry Mumber 269-28-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 2,6 and 9 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 269-28: (5*2)+(4*6)+(3*9)+(2*2)+(1*8)=73 73 % 10 = 3 So 269-28-3 is a valid CAS Registry Number.
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