The CAS Registry Mumber 12007-42-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,0,0 and 7 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 12007-42: (7*1)+(6*2)+(5*0)+(4*0)+(3*7)+(2*4)+(1*2)=50 50 % 10 = 0 So 12007-42-0 is a valid CAS Registry Number.
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