The CAS Registry Mumber 287401-17-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,7,4,0 and 1 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 287401-17: (8*2)+(7*8)+(6*7)+(5*4)+(4*0)+(3*1)+(2*1)+(1*7)=146 146 % 10 = 6 So 287401-17-6 is a valid CAS Registry Number.
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