The CAS Registry Mumber 6890-20-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,8,9 and 0 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 6890-20: (6*6)+(5*8)+(4*9)+(3*0)+(2*2)+(1*0)=116 116 % 10 = 6 So 6890-20-6 is a valid CAS Registry Number.
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