The CAS Registry Mumber 20273-42-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,2,7 and 3 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 20273-42: (7*2)+(6*0)+(5*2)+(4*7)+(3*3)+(2*4)+(1*2)=71 71 % 10 = 1 So 20273-42-1 is a valid CAS Registry Number.
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