The CAS Registry Mumber 69909-28-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,9,0 and 9 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 69909-28: (7*6)+(6*9)+(5*9)+(4*0)+(3*9)+(2*2)+(1*8)=180 180 % 10 = 0 So 69909-28-0 is a valid CAS Registry Number.
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