The CAS Registry Mumber 4538-83-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,5,3 and 8 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 4538-83: (6*4)+(5*5)+(4*3)+(3*8)+(2*8)+(1*3)=104 104 % 10 = 4 So 4538-83-4 is a valid CAS Registry Number.
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