The CAS Registry Mumber 143228-73-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,2,2 and 8 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 143228-73: (8*1)+(7*4)+(6*3)+(5*2)+(4*2)+(3*8)+(2*7)+(1*3)=113 113 % 10 = 3 So 143228-73-3 is a valid CAS Registry Number.
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