The CAS Registry Mumber 179344-74-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,9,3,4 and 4 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 179344-74: (8*1)+(7*7)+(6*9)+(5*3)+(4*4)+(3*4)+(2*7)+(1*4)=172 172 % 10 = 2 So 179344-74-2 is a valid CAS Registry Number.
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