The CAS Registry Mumber 143278-23-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,3,2,7 and 8 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 143278-23: (8*1)+(7*4)+(6*3)+(5*2)+(4*7)+(3*8)+(2*2)+(1*3)=123 123 % 10 = 3 So 143278-23-3 is a valid CAS Registry Number.
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