The CAS Registry Mumber 250268-57-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,0,2,6 and 8 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 250268-57: (8*2)+(7*5)+(6*0)+(5*2)+(4*6)+(3*8)+(2*5)+(1*7)=126 126 % 10 = 6 So 250268-57-6 is a valid CAS Registry Number.
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