The CAS Registry Mumber 73151-71-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,1,5 and 1 respectively; the second part has 2 digits, 7 and 1 respectively. Calculate Digit Verification of CAS Registry Number 73151-71: (7*7)+(6*3)+(5*1)+(4*5)+(3*1)+(2*7)+(1*1)=110 110 % 10 = 0 So 73151-71-0 is a valid CAS Registry Number.
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