The CAS Registry Mumber 113221-71-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,2,2 and 1 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 113221-71: (8*1)+(7*1)+(6*3)+(5*2)+(4*2)+(3*1)+(2*7)+(1*1)=69 69 % 10 = 9 So 113221-71-9 is a valid CAS Registry Number.
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