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4. A bowl contains 8 red marbles, 7 blue marbles and 4 yellow marbles. A man selects marbles at random without looking at them. Provide reasons for your answers! In particular, for each part. decide if the pigeonhole applies. (a) How many marbles must he select to be sure of having at least 5 marbles of the same color? (b) How many marbles must he select to be sure of having at least 4 blue marbles? (c) How many marbles must he select to be sure of having at least 4 blue marbles or 4 yellow marbles