The CAS Registry Mumber 71135-58-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,1,3 and 5 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 71135-58: (7*7)+(6*1)+(5*1)+(4*3)+(3*5)+(2*5)+(1*8)=105 105 % 10 = 5 So 71135-58-5 is a valid CAS Registry Number.
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