The CAS Registry Mumber 72939-23-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,9,3 and 9 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 72939-23: (7*7)+(6*2)+(5*9)+(4*3)+(3*9)+(2*2)+(1*3)=152 152 % 10 = 2 So 72939-23-2 is a valid CAS Registry Number.
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