The CAS Registry Mumber 118539-78-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,5,3 and 9 respectively; the second part has 2 digits, 7 and 8 respectively. Calculate Digit Verification of CAS Registry Number 118539-78: (8*1)+(7*1)+(6*8)+(5*5)+(4*3)+(3*9)+(2*7)+(1*8)=149 149 % 10 = 9 So 118539-78-9 is a valid CAS Registry Number.
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