The CAS Registry Mumber 177034-67-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,7,0,3 and 4 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 177034-67: (8*1)+(7*7)+(6*7)+(5*0)+(4*3)+(3*4)+(2*6)+(1*7)=142 142 % 10 = 2 So 177034-67-2 is a valid CAS Registry Number.
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