The CAS Registry Mumber 245420-84-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,4,5,4,2 and 0 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 245420-84: (8*2)+(7*4)+(6*5)+(5*4)+(4*2)+(3*0)+(2*8)+(1*4)=122 122 % 10 = 2 So 245420-84-2 is a valid CAS Registry Number.
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