The CAS Registry Mumber 898404-97-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,9,8,4,0 and 4 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 898404-97: (8*8)+(7*9)+(6*8)+(5*4)+(4*0)+(3*4)+(2*9)+(1*7)=232 232 % 10 = 2 So 898404-97-2 is a valid CAS Registry Number.
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