The CAS Registry Mumber 19906-67-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,9,0 and 6 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 19906-67: (7*1)+(6*9)+(5*9)+(4*0)+(3*6)+(2*6)+(1*7)=143 143 % 10 = 3 So 19906-67-3 is a valid CAS Registry Number.
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