The CAS Registry Mumber 148379-84-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,8,3,7 and 9 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 148379-84: (8*1)+(7*4)+(6*8)+(5*3)+(4*7)+(3*9)+(2*8)+(1*4)=174 174 % 10 = 4 So 148379-84-4 is a valid CAS Registry Number.
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