The CAS Registry Mumber 842140-58-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,4,2,1,4 and 0 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 842140-58: (8*8)+(7*4)+(6*2)+(5*1)+(4*4)+(3*0)+(2*5)+(1*8)=143 143 % 10 = 3 So 842140-58-3 is a valid CAS Registry Number.
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