Question: Let Ao be a block in a (v, k, 1)-BIBD, say (X, A). Let xe X Ao and show that there are at least k

Let Ao be a block in a (v, k, 1)-BIBD, say (X, A). Let xe X Ao and show that there are at least k blocks that contain x and intersect Ao. From this, deduce that r>k, which implies Fisher's Inequality

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