The CAS Registry Mumber 1272755-28-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,7,2,7,5 and 5 respectively; the second part has 2 digits, 2 and 8 respectively. Calculate Digit Verification of CAS Registry Number 1272755-28: (9*1)+(8*2)+(7*7)+(6*2)+(5*7)+(4*5)+(3*5)+(2*2)+(1*8)=168 168 % 10 = 8 So 1272755-28-8 is a valid CAS Registry Number.
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