The CAS Registry Mumber 115155-09-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,1,5 and 5 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 115155-09: (8*1)+(7*1)+(6*5)+(5*1)+(4*5)+(3*5)+(2*0)+(1*9)=94 94 % 10 = 4 So 115155-09-4 is a valid CAS Registry Number.
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