The CAS Registry Mumber 118506-15-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,8,5,0 and 6 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 118506-15: (8*1)+(7*1)+(6*8)+(5*5)+(4*0)+(3*6)+(2*1)+(1*5)=113 113 % 10 = 3 So 118506-15-3 is a valid CAS Registry Number.
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