Combinations and Permutations
Combinations and Permutations
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Permutation and combination related questions are common in PSC and Bank exams.
Before going to Combinations and Permutations, first lean about factorial.
If \'n\' is a positive integer then, factorial of n is denoted as n!.
5! = ( 1 x 2 x 3 x 4 x 5 ) = 120
4! = (1 x 2 x 3 x 4 ) = 24
Permutations are for lists of items, whose order matters and combinations are for group of items where order doesn’t matter. in other words,
- When the order of items doesn\'t matter, it is called as Combination.
- When the order of items does matter it is called as Permutation.
The number of permutations of n objects taken r at a time is determined by using this formula:
P(n,r)=n!/(n−r)!
Permutation: Listing your 3 favourite football team in order, from list of 10 teams. P(10,3) = 720.
The number of combinations of n objects taken r at a time is determined by using this formula:
C(n,r)=n!/((n−r)!r!)
Combination: Picking a team of 3 people from a football coaching group of 10. C(10,3) = 10!(3!(10−3)!) = 120.
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ആദ്യ കാർട്ടൂൺ മ്യൂസിയം : കായംകുളം .
ആദ്യ തേക്ക് മ്യൂസിയം : വെളിയന്തോട് (നിലമ്പൂർ).
ആദ്യ വാട്ടർ മ്യൂസിയം : കോഴിക്കോട്.
ഇന്ത്യൻ ബിസിനസ് മ്യൂസിയം : ചാലിയം.
കേരളത്തിലെ ആദ്യ ക്രൈം മ്യൂസിയം : തിരുവനന്തപുരം.
കേരളത്തിലെ ആദ്യ പോലീസ് മ്യൂസിയം : കൊല്ലം.
കേരളത്തിലെ ആദ്യ ബാങ്കിഗ് മ്യൂസിയം : തിരുവനന്തപുരം (കവടിയാർ).
കേരളത്തിലെ ആദ്യ സുഗന്ധവ്യഞ്ജന മ്യൂസിയം : കൊച്ചി. LINE...
A cat and dog life : To lead a life full of quarrels.
A cold fish : A person devoid of emotions.
A daredevil : A person who does not care for any consequences.
A deadlock : A position when no progress can be made.
Alive and kicking : Active and healthy.
At sea : Confused or lost.
Be in a tight corner : In a very difficult situation.
Behind one’s back : In the absence of.
Cat and dog life : Life full of quarrels.
Cock and bull story : Made up story that one should not believe.
Cry for the moon : Ask for the impossible.
Double : dealing : Deceiving.
Have a card up one’s sleeve : Have a secret plan in reserve.
Like a cat on hot bricks : Very nervous.
Run over : to drive over.
Run through : to squander or waste.
Tell against : To prove adverse to; to go against.
To bell the cat : To face the risk.
To break t...
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