The CAS Registry Mumber 117020-90-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,0,2 and 0 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 117020-90: (8*1)+(7*1)+(6*7)+(5*0)+(4*2)+(3*0)+(2*9)+(1*0)=83 83 % 10 = 3 So 117020-90-3 is a valid CAS Registry Number.
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