The CAS Registry Mumber 478248-47-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,7,8,2,4 and 8 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 478248-47: (8*4)+(7*7)+(6*8)+(5*2)+(4*4)+(3*8)+(2*4)+(1*7)=194 194 % 10 = 4 So 478248-47-4 is a valid CAS Registry Number.
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