The CAS Registry Mumber 1442-83-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,4,4 and 2 respectively; the second part has 2 digits, 8 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1442-83: (6*1)+(5*4)+(4*4)+(3*2)+(2*8)+(1*3)=67 67 % 10 = 7 So 1442-83-7 is a valid CAS Registry Number.
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