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Question: linear algebra problem just short answers please ...

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Linear Algebra problem. Just short answers please. :)
A General Approach To Subsets of A Set. Let X be a set of size m and let S,S, be subsets of it. Build an mxn (0,1)-matrix M as follows: the rows are indexed by the elements of X and the columns by the subsets-then put a1 in position if the row is an element of the column. This is an incidence matrix. 19. D What does JyM compute? What does M., compute? What does the i,j- entry of MM represent? What does the i,j-entry of MMT represent? ②
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