The CAS Registry Mumber 72502-79-5 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, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 72502-79: (7*7)+(6*2)+(5*5)+(4*0)+(3*2)+(2*7)+(1*9)=115 115 % 10 = 5 So 72502-79-5 is a valid CAS Registry Number.
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