The CAS Registry Mumber 109269-68-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,2,6 and 9 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 109269-68: (8*1)+(7*0)+(6*9)+(5*2)+(4*6)+(3*9)+(2*6)+(1*8)=143 143 % 10 = 3 So 109269-68-3 is a valid CAS Registry Number.
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