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3. In how many ways can the Principal and the 8 Headteachers of the different
departments be seated in a round table for their staff meeting?
4. Sheina has 10 different keys. In how many ways can she arrange the keys in
a key chain?​

Sagot :

Jovelynshopeeviz

3.5040

4.1

3.circular permutation problem

formula-(n-1)!

(8-1)!=7!

7*6*5*4*3*2*1

=5040

4.combination

C(n,r)=n!/r!(n-r)!

=10!/10!(10-10)!

=10!/10!0!

=1