The CAS Registry Mumber 89999-65-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,9,9,9 and 9 respectively; the second part has 2 digits, 6 and 5 respectively. Calculate Digit Verification of CAS Registry Number 89999-65: (7*8)+(6*9)+(5*9)+(4*9)+(3*9)+(2*6)+(1*5)=235 235 % 10 = 5 So 89999-65-5 is a valid CAS Registry Number.
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