The CAS Registry Mumber 151171-58-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,1,1,7 and 1 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 151171-58: (8*1)+(7*5)+(6*1)+(5*1)+(4*7)+(3*1)+(2*5)+(1*8)=103 103 % 10 = 3 So 151171-58-3 is a valid CAS Registry Number.
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