The CAS Registry Mumber 68889-49-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,8,8 and 9 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 68889-49: (7*6)+(6*8)+(5*8)+(4*8)+(3*9)+(2*4)+(1*9)=206 206 % 10 = 6 So 68889-49-6 is a valid CAS Registry Number.
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