The CAS Registry Mumber 73138-41-7 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, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 73138-41: (7*7)+(6*3)+(5*1)+(4*3)+(3*8)+(2*4)+(1*1)=117 117 % 10 = 7 So 73138-41-7 is a valid CAS Registry Number.
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