The CAS Registry Mumber 288391-09-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,8,3,9 and 1 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 288391-09: (8*2)+(7*8)+(6*8)+(5*3)+(4*9)+(3*1)+(2*0)+(1*9)=183 183 % 10 = 3 So 288391-09-3 is a valid CAS Registry Number.
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