The CAS Registry Mumber 842140-75-4 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, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 842140-75: (8*8)+(7*4)+(6*2)+(5*1)+(4*4)+(3*0)+(2*7)+(1*5)=144 144 % 10 = 4 So 842140-75-4 is a valid CAS Registry Number.
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