The CAS Registry Mumber 105186-25-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,1,8 and 6 respectively; the second part has 2 digits, 2 and 5 respectively. Calculate Digit Verification of CAS Registry Number 105186-25: (8*1)+(7*0)+(6*5)+(5*1)+(4*8)+(3*6)+(2*2)+(1*5)=102 102 % 10 = 2 So 105186-25-2 is a valid CAS Registry Number.
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