The CAS Registry Mumber 103904-98-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,9,0 and 4 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 103904-98: (8*1)+(7*0)+(6*3)+(5*9)+(4*0)+(3*4)+(2*9)+(1*8)=109 109 % 10 = 9 So 103904-98-9 is a valid CAS Registry Number.
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