The CAS Registry Mumber 69821-39-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,8,2 and 1 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 69821-39: (7*6)+(6*9)+(5*8)+(4*2)+(3*1)+(2*3)+(1*9)=162 162 % 10 = 2 So 69821-39-2 is a valid CAS Registry Number.
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