The CAS Registry Mumber 2044-00-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,0,4 and 4 respectively; the second part has 2 digits, 0 and 0 respectively. Calculate Digit Verification of CAS Registry Number 2044-00: (6*2)+(5*0)+(4*4)+(3*4)+(2*0)+(1*0)=40 40 % 10 = 0 So 2044-00-0 is a valid CAS Registry Number.
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