The CAS Registry Mumber 876725-80-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,6,7,2 and 5 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 876725-80: (8*8)+(7*7)+(6*6)+(5*7)+(4*2)+(3*5)+(2*8)+(1*0)=223 223 % 10 = 3 So 876725-80-3 is a valid CAS Registry Number.
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