The CAS Registry Mumber 174656-34-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,4,6,5 and 6 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 174656-34: (8*1)+(7*7)+(6*4)+(5*6)+(4*5)+(3*6)+(2*3)+(1*4)=159 159 % 10 = 9 So 174656-34-9 is a valid CAS Registry Number.
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