The CAS Registry Mumber 99246-81-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,2,4 and 6 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 99246-81: (7*9)+(6*9)+(5*2)+(4*4)+(3*6)+(2*8)+(1*1)=178 178 % 10 = 8 So 99246-81-8 is a valid CAS Registry Number.
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