The CAS Registry Mumber 128879-57-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,8,7 and 9 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 128879-57: (8*1)+(7*2)+(6*8)+(5*8)+(4*7)+(3*9)+(2*5)+(1*7)=182 182 % 10 = 2 So 128879-57-2 is a valid CAS Registry Number.
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