The CAS Registry Mumber 505093-51-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,0,5,0,9 and 3 respectively; the second part has 2 digits, 5 and 1 respectively. Calculate Digit Verification of CAS Registry Number 505093-51: (8*5)+(7*0)+(6*5)+(5*0)+(4*9)+(3*3)+(2*5)+(1*1)=126 126 % 10 = 6 So 505093-51-6 is a valid CAS Registry Number.
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