The CAS Registry Mumber 94713-20-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,7,1 and 3 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 94713-20: (7*9)+(6*4)+(5*7)+(4*1)+(3*3)+(2*2)+(1*0)=139 139 % 10 = 9 So 94713-20-9 is a valid CAS Registry Number.
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