The CAS Registry Mumber 82769-90-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,7,6 and 9 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 82769-90: (7*8)+(6*2)+(5*7)+(4*6)+(3*9)+(2*9)+(1*0)=172 172 % 10 = 2 So 82769-90-2 is a valid CAS Registry Number.
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