The CAS Registry Mumber 173954-62-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,9,5 and 4 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 173954-62: (8*1)+(7*7)+(6*3)+(5*9)+(4*5)+(3*4)+(2*6)+(1*2)=166 166 % 10 = 6 So 173954-62-6 is a valid CAS Registry Number.
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