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How to use a scientific calculator. Arranging numbers and combining numbers?
Arranging numbers: first press the number m, then press "nPr" on the calculator, then press the number n, indicating that n out of m elements are taken and arranged in an orderly fashion

Combining numbers: first press the number m, then press "nCr" on the calculator, then press the number n, indicating that n out of m elements are combined

Combining numbers: first press the number m, then press "nCr" on the calculator, then press the number n, indicating the number of combinations of n out of m elements

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