The CAS Registry Mumber 121888-67-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,8,8 and 8 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 121888-67: (8*1)+(7*2)+(6*1)+(5*8)+(4*8)+(3*8)+(2*6)+(1*7)=143 143 % 10 = 3 So 121888-67-3 is a valid CAS Registry Number.
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