The CAS Registry Mumber 73465-37-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,4,6 and 5 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 73465-37: (7*7)+(6*3)+(5*4)+(4*6)+(3*5)+(2*3)+(1*7)=139 139 % 10 = 9 So 73465-37-9 is a valid CAS Registry Number.
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