Project Pairings

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A teacher wants every student to work on a project. A student can work on a single project, either alone or with a partner (group of 2). The teacher is okay with any number of pairs or sole workers. The teacher is curious to know that how many possible ways can N students form pairs or stay solo. Can you help? Note: Since the answer can be large, print it modulo 109+7 Input The first line of

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solution.cppC++17

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