The CAS Registry Mumber 462116-80-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,6,2,1,1 and 6 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 462116-80: (8*4)+(7*6)+(6*2)+(5*1)+(4*1)+(3*6)+(2*8)+(1*0)=129 129 % 10 = 9 So 462116-80-9 is a valid CAS Registry Number.
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