The CAS Registry Mumber 84605-20-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,6,0 and 5 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 84605-20: (7*8)+(6*4)+(5*6)+(4*0)+(3*5)+(2*2)+(1*0)=129 129 % 10 = 9 So 84605-20-9 is a valid CAS Registry Number.
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