The CAS Registry Mumber 129273-17-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,2,7 and 3 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 129273-17: (8*1)+(7*2)+(6*9)+(5*2)+(4*7)+(3*3)+(2*1)+(1*7)=132 132 % 10 = 2 So 129273-17-2 is a valid CAS Registry Number.
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