The CAS Registry Mumber 188824-80-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,8,2 and 4 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 188824-80: (8*1)+(7*8)+(6*8)+(5*8)+(4*2)+(3*4)+(2*8)+(1*0)=188 188 % 10 = 8 So 188824-80-8 is a valid CAS Registry Number.
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