The CAS Registry Mumber 158182-20-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,8,1,8 and 2 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 158182-20: (8*1)+(7*5)+(6*8)+(5*1)+(4*8)+(3*2)+(2*2)+(1*0)=138 138 % 10 = 8 So 158182-20-8 is a valid CAS Registry Number.
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