The CAS Registry Mumber 137864-38-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,8,6 and 4 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 137864-38: (8*1)+(7*3)+(6*7)+(5*8)+(4*6)+(3*4)+(2*3)+(1*8)=161 161 % 10 = 1 So 137864-38-1 is a valid CAS Registry Number.
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