The CAS Registry Mumber 81398-48-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,3,9 and 8 respectively; the second part has 2 digits, 4 and 8 respectively. Calculate Digit Verification of CAS Registry Number 81398-48: (7*8)+(6*1)+(5*3)+(4*9)+(3*8)+(2*4)+(1*8)=153 153 % 10 = 3 So 81398-48-3 is a valid CAS Registry Number.
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