The CAS Registry Mumber 68139-68-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,1,3 and 9 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 68139-68: (7*6)+(6*8)+(5*1)+(4*3)+(3*9)+(2*6)+(1*8)=154 154 % 10 = 4 So 68139-68-4 is a valid CAS Registry Number.
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