The CAS Registry Mumber 122900-89-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,9,0 and 0 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 122900-89: (8*1)+(7*2)+(6*2)+(5*9)+(4*0)+(3*0)+(2*8)+(1*9)=104 104 % 10 = 4 So 122900-89-4 is a valid CAS Registry Number.
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