The CAS Registry Mumber 162857-58-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,2,8,5 and 7 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 162857-58: (8*1)+(7*6)+(6*2)+(5*8)+(4*5)+(3*7)+(2*5)+(1*8)=161 161 % 10 = 1 So 162857-58-1 is a valid CAS Registry Number.
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