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.
ഈഴവ മെമ്മോറിയൽ ഈഴവർക്ക് നേരെയുള്ള അവഗണന അവസാനിപ്പിക്കണമെന്ന് ആവശ്യപ്പെട്ടുകൊണ്ട് 13,176 ഈഴവർ ഒപ്പിട്ട് 1896 സെപ്റ്റംബർ 3ന് തിരുവിതാംകൂർ മഹാരാജാവ് ശ്രീമൂലം തിരുനാളിനു് ഡോ. പല്പുവിന്റെ നേതൃത്വത്തിൽ സമർപ്പിച്ച മഹാനിവേദനമാണു് ഈഴവമെമ്മോറിയൽ അഥവാ ഈഴവമെമ്മോറിയൽ ഹർജി എന്നറിയപ്പെടുന്നതു് സർക്കാർ സർവീസിൽ നാട്ടുകാർക്ക് ന്യായമായ പങ്ക് ലഭിക്കാൻ വേണ്ടിയൊരു നിവേദനം ജി.പി. പിള്ള...
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