The CAS Registry Mumber 73839-74-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,8,3 and 9 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 73839-74: (7*7)+(6*3)+(5*8)+(4*3)+(3*9)+(2*7)+(1*4)=164 164 % 10 = 4 So 73839-74-4 is a valid CAS Registry Number.
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