The CAS Registry Mumber 188755-20-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,7,5 and 5 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 188755-20: (8*1)+(7*8)+(6*8)+(5*7)+(4*5)+(3*5)+(2*2)+(1*0)=186 186 % 10 = 6 So 188755-20-6 is a valid CAS Registry Number.
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