The CAS Registry Mumber 129984-38-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,9,8 and 4 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 129984-38: (8*1)+(7*2)+(6*9)+(5*9)+(4*8)+(3*4)+(2*3)+(1*8)=179 179 % 10 = 9 So 129984-38-9 is a valid CAS Registry Number.
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