The CAS Registry Mumber 98665-67-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,8,6,6 and 5 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 98665-67: (7*9)+(6*8)+(5*6)+(4*6)+(3*5)+(2*6)+(1*7)=199 199 % 10 = 9 So 98665-67-9 is a valid CAS Registry Number.
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