The CAS Registry Mumber 104809-87-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,4,8,0 and 9 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 104809-87: (8*1)+(7*0)+(6*4)+(5*8)+(4*0)+(3*9)+(2*8)+(1*7)=122 122 % 10 = 2 So 104809-87-2 is a valid CAS Registry Number.
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