The CAS Registry Mumber 173106-29-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,1,0 and 6 respectively; the second part has 2 digits, 2 and 9 respectively. Calculate Digit Verification of CAS Registry Number 173106-29: (8*1)+(7*7)+(6*3)+(5*1)+(4*0)+(3*6)+(2*2)+(1*9)=111 111 % 10 = 1 So 173106-29-1 is a valid CAS Registry Number.
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