The CAS Registry Mumber 124339-69-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,4,3,3 and 9 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 124339-69: (8*1)+(7*2)+(6*4)+(5*3)+(4*3)+(3*9)+(2*6)+(1*9)=121 121 % 10 = 1 So 124339-69-1 is a valid CAS Registry Number.
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