The CAS Registry Mumber 82538-13-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,5,3 and 8 respectively; the second part has 2 digits, 1 and 3 respectively. Calculate Digit Verification of CAS Registry Number 82538-13: (7*8)+(6*2)+(5*5)+(4*3)+(3*8)+(2*1)+(1*3)=134 134 % 10 = 4 So 82538-13-4 is a valid CAS Registry Number.
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