The CAS Registry Mumber 80155-81-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,1,5 and 5 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 80155-81: (7*8)+(6*0)+(5*1)+(4*5)+(3*5)+(2*8)+(1*1)=113 113 % 10 = 3 So 80155-81-3 is a valid CAS Registry Number.
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