The CAS Registry Mumber 72480-42-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,4,8 and 0 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 72480-42: (7*7)+(6*2)+(5*4)+(4*8)+(3*0)+(2*4)+(1*2)=123 123 % 10 = 3 So 72480-42-3 is a valid CAS Registry Number.
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