Question

please solve this question of NCERT book chapter permutation combination

Answer 1

First to choose the chairman, there are 8 persons present. So we can choose the chairman in 8 ways.
Now after one person is chosen as the chairman, there are only 7 persons present.
We can now choose the vice chairman in 7 ways for each chairman.
Therefore, we can do the whole process in 8×7 =56 ways.....
I think this will make you understand.
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Answer 2

8p2
8!/(8-2)! =》(8×7×6!)/6!
=》8×7 = 56