Saved Bookmarks
| 1. |
There are n white and n black balls marked 1, 2, 3, …… n. The number of ways in which we canarrange these balls in a row so that neighbouring balls are of different colours are:- |
|
Answer» N! Case II: `B_1/1 W_1/2 B_2/3 W_2/4 B_3/5W_3/6` .....`B_n` `W_n/(2n^(th)"place")` =n! x n! So number of WAYS =`2(n!)^2` |
|