The CAS Registry Mumber 124034-04-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,4,0,3 and 4 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 124034-04: (8*1)+(7*2)+(6*4)+(5*0)+(4*3)+(3*4)+(2*0)+(1*4)=74 74 % 10 = 4 So 124034-04-4 is a valid CAS Registry Number.
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