Arrangement !!

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Write a program to find Permutations in which n people can occupy r seats in a classroom. ###Input: - First line will contain $T$, number of testcases. Then the testcases follow. - Each testcase contains of a two input $n$ and $r$. ###Output: For each testcase, print total arrangement. ###Sample Input: 1 5 2 ###Sample Output: 20 ###EXPLANATION: Total arrangement to

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solution.cppC++17

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