The CAS Registry Mumber 474647-97-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,7,4,6,4 and 7 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 474647-97: (8*4)+(7*7)+(6*4)+(5*6)+(4*4)+(3*7)+(2*9)+(1*7)=197 197 % 10 = 7 So 474647-97-7 is a valid CAS Registry Number.
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