The CAS Registry Mumber 274905-38-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,7,4,9,0 and 5 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 274905-38: (8*2)+(7*7)+(6*4)+(5*9)+(4*0)+(3*5)+(2*3)+(1*8)=163 163 % 10 = 3 So 274905-38-3 is a valid CAS Registry Number.
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