The CAS Registry Mumber 1243271-20-6 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,4,3,2,7 and 1 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1243271-20: (9*1)+(8*2)+(7*4)+(6*3)+(5*2)+(4*7)+(3*1)+(2*2)+(1*0)=116 116 % 10 = 6 So 1243271-20-6 is a valid CAS Registry Number.
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