The CAS Registry Mumber 84412-99-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,4,4,1 and 2 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 84412-99: (7*8)+(6*4)+(5*4)+(4*1)+(3*2)+(2*9)+(1*9)=137 137 % 10 = 7 So 84412-99-7 is a valid CAS Registry Number.
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