The CAS Registry Mumber 149717-55-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,9,7,1 and 7 respectively; the second part has 2 digits, 5 and 5 respectively. Calculate Digit Verification of CAS Registry Number 149717-55: (8*1)+(7*4)+(6*9)+(5*7)+(4*1)+(3*7)+(2*5)+(1*5)=165 165 % 10 = 5 So 149717-55-5 is a valid CAS Registry Number.
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