The CAS Registry Mumber 12109-43-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,1,0 and 9 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 12109-43: (7*1)+(6*2)+(5*1)+(4*0)+(3*9)+(2*4)+(1*3)=62 62 % 10 = 2 So 12109-43-2 is a valid CAS Registry Number.
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