There are 6 mobile phones (A1, A2, A3, A4, A5, A6) from Brand A and 5 mobile phones (B1, B2, B3, B4, B5) from Brand B. If they are placed in one row, find the number of arrangement if any two mobile phones from Brand B must not be placed next to each other.
Thanks!
permutation and combination
2013-03-19 3:42 am
回答 (1)
2013-03-19 4:27 am
✔ 最佳答案
(1)A(2)A(3)A(4)A(5)A(6)A(7)There are 7 positions to put the 5 brand B phones. There are 7C5 = 21 ways to do so.
Including the permutations of the brand A and brand B phones, there are 21(5!)(6!)=1,814,400 arrangements.
收錄日期: 2021-04-23 23:26:34
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