The CAS Registry Mumber 195054-56-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,5,0,5 and 4 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 195054-56: (8*1)+(7*9)+(6*5)+(5*0)+(4*5)+(3*4)+(2*5)+(1*6)=149 149 % 10 = 9 So 195054-56-9 is a valid CAS Registry Number.
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