The CAS Registry Mumber 176909-92-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,6,9,0 and 9 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 176909-92: (8*1)+(7*7)+(6*6)+(5*9)+(4*0)+(3*9)+(2*9)+(1*2)=185 185 % 10 = 5 So 176909-92-5 is a valid CAS Registry Number.
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