The CAS Registry Mumber 83289-22-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,3,2,8 and 9 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 83289-22: (7*8)+(6*3)+(5*2)+(4*8)+(3*9)+(2*2)+(1*2)=149 149 % 10 = 9 So 83289-22-9 is a valid CAS Registry Number.
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