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**Below is my question:

It is an example from the book " A Primer on linear modes" by Monahan**

enter image description here I have 3 questions

Question 1:

is how did he calculated the matrix λ

Question 2:

Why $λ $ it is not in $C $( $X^T$)

Question 3:

How do we know that specifically $α_1 $ is non-estimable and not $a_2$

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