The CAS Registry Mumber 178311-73-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,8,3,1 and 1 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 178311-73: (8*1)+(7*7)+(6*8)+(5*3)+(4*1)+(3*1)+(2*7)+(1*3)=144 144 % 10 = 4 So 178311-73-4 is a valid CAS Registry Number.
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