The CAS Registry Mumber 125664-69-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,5,6,6 and 4 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 125664-69: (8*1)+(7*2)+(6*5)+(5*6)+(4*6)+(3*4)+(2*6)+(1*9)=139 139 % 10 = 9 So 125664-69-9 is a valid CAS Registry Number.
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