The CAS Registry Mumber 188432-34-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,4,3 and 2 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 188432-34: (8*1)+(7*8)+(6*8)+(5*4)+(4*3)+(3*2)+(2*3)+(1*4)=160 160 % 10 = 0 So 188432-34-0 is a valid CAS Registry Number.
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