The CAS Registry Mumber 743-07-7 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 7,4 and 3 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 743-07: (5*7)+(4*4)+(3*3)+(2*0)+(1*7)=67 67 % 10 = 7 So 743-07-7 is a valid CAS Registry Number.
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