The CAS Registry Mumber 5575-20-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,5,7 and 5 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 5575-20: (6*5)+(5*5)+(4*7)+(3*5)+(2*2)+(1*0)=102 102 % 10 = 2 So 5575-20-2 is a valid CAS Registry Number.
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