The CAS Registry Mumber 100992-89-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,0,9,9 and 2 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 100992-89: (8*1)+(7*0)+(6*0)+(5*9)+(4*9)+(3*2)+(2*8)+(1*9)=120 120 % 10 = 0 So 100992-89-0 is a valid CAS Registry Number.
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