The CAS Registry Mumber 108193-67-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,8,1,9 and 3 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 108193-67: (8*1)+(7*0)+(6*8)+(5*1)+(4*9)+(3*3)+(2*6)+(1*7)=125 125 % 10 = 5 So 108193-67-5 is a valid CAS Registry Number.
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