The CAS Registry Mumber 72502-80-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,5,0 and 2 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 72502-80: (7*7)+(6*2)+(5*5)+(4*0)+(3*2)+(2*8)+(1*0)=108 108 % 10 = 8 So 72502-80-8 is a valid CAS Registry Number.
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