The CAS Registry Mumber 142755-11-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,7,5 and 5 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 142755-11: (8*1)+(7*4)+(6*2)+(5*7)+(4*5)+(3*5)+(2*1)+(1*1)=121 121 % 10 = 1 So 142755-11-1 is a valid CAS Registry Number.
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