The CAS Registry Mumber 109898-95-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,8,9 and 8 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 109898-95: (8*1)+(7*0)+(6*9)+(5*8)+(4*9)+(3*8)+(2*9)+(1*5)=185 185 % 10 = 5 So 109898-95-5 is a valid CAS Registry Number.
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