The CAS Registry Mumber 1344-74-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,3,4 and 4 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 1344-74: (6*1)+(5*3)+(4*4)+(3*4)+(2*7)+(1*4)=67 67 % 10 = 7 So 1344-74-7 is a valid CAS Registry Number.
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