The CAS Registry Mumber 75535-28-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,5,3 and 5 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 75535-28: (7*7)+(6*5)+(5*5)+(4*3)+(3*5)+(2*2)+(1*8)=143 143 % 10 = 3 So 75535-28-3 is a valid CAS Registry Number.
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