The CAS Registry Mumber 174638-41-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,4,6,3 and 8 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 174638-41: (8*1)+(7*7)+(6*4)+(5*6)+(4*3)+(3*8)+(2*4)+(1*1)=156 156 % 10 = 6 So 174638-41-6 is a valid CAS Registry Number.
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