how many 4-digit numbers can be formed from 1,2,3,4, and 5 if no repitition allowed/ if repitition allowed?​

Question

how many 4-digit numbers can be formed from 1,2,3,4, and 5 if no repitition allowed/ if repitition allowed?​

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Thu Hương 3 years 2021-08-08T01:00:23+00:00 1 Answers 11 views 0

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  1. thienhuong
    0
    2021-08-08T01:01:25+00:00
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    Answer:

    16

    Step-by-step explanation:

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