The CAS Registry Mumber 634187-67-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,4,1,8 and 7 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 634187-67: (8*6)+(7*3)+(6*4)+(5*1)+(4*8)+(3*7)+(2*6)+(1*7)=170 170 % 10 = 0 So 634187-67-0 is a valid CAS Registry Number.
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