The CAS Registry Mumber 100920-92-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,0,9,2 and 0 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 100920-92: (8*1)+(7*0)+(6*0)+(5*9)+(4*2)+(3*0)+(2*9)+(1*2)=81 81 % 10 = 1 So 100920-92-1 is a valid CAS Registry Number.
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