The CAS Registry Mumber 80878-29-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,8,7 and 8 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 80878-29: (7*8)+(6*0)+(5*8)+(4*7)+(3*8)+(2*2)+(1*9)=161 161 % 10 = 1 So 80878-29-1 is a valid CAS Registry Number.
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