The CAS Registry Mumber 68990-82-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,8,9,9 and 0 respectively; the second part has 2 digits, 8 and 2 respectively. Calculate Digit Verification of CAS Registry Number 68990-82: (7*6)+(6*8)+(5*9)+(4*9)+(3*0)+(2*8)+(1*2)=189 189 % 10 = 9 So 68990-82-9 is a valid CAS Registry Number.
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