The CAS Registry Mumber 402913-84-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,0,2,9,1 and 3 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 402913-84: (8*4)+(7*0)+(6*2)+(5*9)+(4*1)+(3*3)+(2*8)+(1*4)=122 122 % 10 = 2 So 402913-84-2 is a valid CAS Registry Number.
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