1_Peruutations :
any arrans ement of a set n objects in
agivers is called permntation
of the obseative
(taken all ab time ,donb repeat dement
P(n,r)=n1/(n-r)!
P(n,r)= number of permmtations ,
n= objects
R= taken at time
Example:
How many different ways to select 4
different players from 10 players on
ateam to play fonr tennis
mataches(data repeat plyer)
Solution :
2_combinations:
n-combination elements of a set is an
unordered selction of relements
from the set thes ,an n_combinations is simply asub set of
the set with relement
C(n,r)=n!/r!(n-r)!
Example::
How many ways are there to select s
player from 10 members tennis
team to meke atrip to match at
amother school?
Solution :
Example::
If n=11 ,r=6 , fine the follow
1-Peruutations
2-combination
Solution :
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