The CAS Registry Mumber 109669-20-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,6,6 and 9 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 109669-20: (8*1)+(7*0)+(6*9)+(5*6)+(4*6)+(3*9)+(2*2)+(1*0)=147 147 % 10 = 7 So 109669-20-7 is a valid CAS Registry Number.
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