The CAS Registry Mumber 286961-73-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,6,9,6 and 1 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 286961-73: (8*2)+(7*8)+(6*6)+(5*9)+(4*6)+(3*1)+(2*7)+(1*3)=197 197 % 10 = 7 So 286961-73-7 is a valid CAS Registry Number.
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