The CAS Registry Mumber 54509-79-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,5,0 and 9 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 54509-79: (7*5)+(6*4)+(5*5)+(4*0)+(3*9)+(2*7)+(1*9)=134 134 % 10 = 4 So 54509-79-4 is a valid CAS Registry Number.
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