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Let Mn be the nxn matrix that has 2’s along the main diagonal, 3’s directly above the main diagonal, 1’s directly below the main diagonal and 0’s elsewhere. Let dn = det[Mn]. Clearly, d1 = 2 and d2 = 1. (a) Use Laplace expansions to find an expression for dn in terms of dn-1 and dn-2. (This expression will be valid for all integers n > 2).

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