The CAS Registry Mumber 178680-64-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,8,6,8 and 0 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 178680-64: (8*1)+(7*7)+(6*8)+(5*6)+(4*8)+(3*0)+(2*6)+(1*4)=183 183 % 10 = 3 So 178680-64-3 is a valid CAS Registry Number.
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