The CAS Registry Mumber 99849-25-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,8,4 and 9 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 99849-25: (7*9)+(6*9)+(5*8)+(4*4)+(3*9)+(2*2)+(1*5)=209 209 % 10 = 9 So 99849-25-9 is a valid CAS Registry Number.
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