The CAS Registry Mumber 113428-25-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,4,2 and 8 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 113428-25: (8*1)+(7*1)+(6*3)+(5*4)+(4*2)+(3*8)+(2*2)+(1*5)=94 94 % 10 = 4 So 113428-25-4 is a valid CAS Registry Number.
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