Question: 2. How many words does an English text need to have, so that at least two words start with the same letter? 2. Suppose you

2. How many words does an English text need to have, so that at least two words start with the same letter? 2. Suppose you place 5 rooks on a 4 x 4 grid (checkerboard). Can you avoid two rooks (or more) threaten each other? (Think about pigeonhole principle )

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