A gardener has r ≥ 1 red tulips and b ≥ 1 blue tulips, each in its own pot. She plans to plant them in a line along the edge of her driveway. In how many visually distinguishable ways can she arrange them?
Gossett, Eric, "Counting Tulips: Three Combinatorial Proofs" (2007). ACMS Conference Proceedings 2007. 6.
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