The CAS Registry Mumber 137929-24-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,9,2 and 9 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 137929-24: (8*1)+(7*3)+(6*7)+(5*9)+(4*2)+(3*9)+(2*2)+(1*4)=159 159 % 10 = 9 So 137929-24-9 is a valid CAS Registry Number.
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