The CAS Registry Mumber 74904-40-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,9,0 and 4 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 74904-40: (7*7)+(6*4)+(5*9)+(4*0)+(3*4)+(2*4)+(1*0)=138 138 % 10 = 8 So 74904-40-8 is a valid CAS Registry Number.
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