The CAS Registry Mumber 131438-69-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,4,3 and 8 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 131438-69: (8*1)+(7*3)+(6*1)+(5*4)+(4*3)+(3*8)+(2*6)+(1*9)=112 112 % 10 = 2 So 131438-69-2 is a valid CAS Registry Number.
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