The CAS Registry Mumber 2857-74-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,8,5 and 7 respectively; the second part has 2 digits, 7 and 4 respectively. Calculate Digit Verification of CAS Registry Number 2857-74: (6*2)+(5*8)+(4*5)+(3*7)+(2*7)+(1*4)=111 111 % 10 = 1 So 2857-74-1 is a valid CAS Registry Number.
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