The CAS Registry Mumber 6217-29-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,2,1 and 7 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 6217-29: (6*6)+(5*2)+(4*1)+(3*7)+(2*2)+(1*9)=84 84 % 10 = 4 So 6217-29-4 is a valid CAS Registry Number.
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