The CAS Registry Mumber 186456-55-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,6,4,5 and 6 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 186456-55: (8*1)+(7*8)+(6*6)+(5*4)+(4*5)+(3*6)+(2*5)+(1*5)=173 173 % 10 = 3 So 186456-55-3 is a valid CAS Registry Number.
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