The CAS Registry Mumber 731795-80-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,3,1,7,9 and 5 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 731795-80: (8*7)+(7*3)+(6*1)+(5*7)+(4*9)+(3*5)+(2*8)+(1*0)=185 185 % 10 = 5 So 731795-80-5 is a valid CAS Registry Number.
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