The CAS Registry Mumber 6378-84-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,3,7 and 8 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 6378-84: (6*6)+(5*3)+(4*7)+(3*8)+(2*8)+(1*4)=123 123 % 10 = 3 So 6378-84-3 is a valid CAS Registry Number.
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