The CAS Registry Mumber 166982-20-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,6,9,8 and 2 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 166982-20: (8*1)+(7*6)+(6*6)+(5*9)+(4*8)+(3*2)+(2*2)+(1*0)=173 173 % 10 = 3 So 166982-20-3 is a valid CAS Registry Number.
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