How many different ways can 5 students line up in a cafteria

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How many different ways can 5 students line up in a cafteria

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MichaelMet 2 months 2021-07-25T16:48:08+00:00 1 Answers 2 views 0

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    2021-07-25T16:49:46+00:00

    Ans: 120 different ways

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )