The CAS Registry Mumber 73138-51-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,1,3 and 8 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 73138-51: (7*7)+(6*3)+(5*1)+(4*3)+(3*8)+(2*5)+(1*1)=119 119 % 10 = 9 So 73138-51-9 is a valid CAS Registry Number.
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