The CAS Registry Mumber 802040-93-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,0,2,0,4 and 0 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 802040-93: (8*8)+(7*0)+(6*2)+(5*0)+(4*4)+(3*0)+(2*9)+(1*3)=113 113 % 10 = 3 So 802040-93-3 is a valid CAS Registry Number.
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