The CAS Registry Mumber 123186-84-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,3,1,8 and 6 respectively; the second part has 2 digits, 8 and 4 respectively. Calculate Digit Verification of CAS Registry Number 123186-84: (8*1)+(7*2)+(6*3)+(5*1)+(4*8)+(3*6)+(2*8)+(1*4)=115 115 % 10 = 5 So 123186-84-5 is a valid CAS Registry Number.
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