The CAS Registry Mumber 103404-69-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,3,4,0 and 4 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 103404-69: (8*1)+(7*0)+(6*3)+(5*4)+(4*0)+(3*4)+(2*6)+(1*9)=79 79 % 10 = 9 So 103404-69-9 is a valid CAS Registry Number.
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