The CAS Registry Mumber 40039-62-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,0,3 and 9 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 40039-62: (7*4)+(6*0)+(5*0)+(4*3)+(3*9)+(2*6)+(1*2)=81 81 % 10 = 1 So 40039-62-1 is a valid CAS Registry Number.
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