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.
Cities And Their Nicknames are given below.
അഞ്ചു നദികളുടെ നാട് പഞ്ചാബ് .
അറബിക്കടലിന്റെ റാണി കൊച്ചി .
ആപ്പിൾ സംസ്ഥാനം ഹിമാചൽ പ്രദേശ് .
ഇന്ത്യയിലെ ഓക്സ്ഫോർഡ് പൂനെ .
ഇന്ത്യയുടെ കവാടം മുംബെ .
ഇന്ത്യയുടെ കോഹിനൂർ ആന്ധ്രാപ്രദേശ് .
ഇന്ത്യയുടെ തേയിലത്തോട്ടം അസ്സം .
ഇന്ത്യയുടെ പാൽത്തൊട്ടി ഹരിയാന .
ഇന്ത്യയുടെ പൂന്തോട്ടം ബംഗളൂരു .
ഇന്ത്യയുടെ മുന്തിരി നഗരം നാസ...
Journalism .
Breaking news : Staff of the East Bay Times, for their coverage of the Ghost Ship fire.
Breaking news photography : Daniel Berehulak, freelancer, for his photography of government assault on drug dealers and users in the Philippines.
Commentary : Peggy Noonan of the Wall Street Journal, for her coverage of the election season.
Criticism : Hilton Als of the New Yorker, for his theater reviews.
Editorial cartooning : Jim Morin of the Miami Herald, for his political cartoons.
Editorial writing : Art Cullen of the Storm Lake Times, for his coverage of Iowa’s corporate agricultural interests.
Explanatory reporting : International Consortium of Investigative Journalists, McClatchy and Miami Herald, for the Panama Papers.
Feature photography : E. Jason Wambsgans of the Chicago Tribune, for his photo essay on a child who survive...
കേരളത്തിലെ ദേശീയപാതകൾ NH No. Route .
NH 66 Thalappady - Parassala .
NH 544 Valayar - Edappally .
NH 85 Bodimettu - Kundannoor .
NH 183 Kollam - Sasthamkota-Chengannur-Kottayam-Vandiperiyar-Kumily .
NH 183A Sasthamkota - Adoor - Pathanamthitta - Vandiperiyar .
NH 185 Adimali -Cheruthoni- Painavu -Kumily (NH 183) .
NH 744 Kollam - Aryankavu .
NH 766 Kozhikode - Muthanga .
NH 966 Ramanattukara - Palakkad .
NH 966A Kalamassery - Vallarpadam .
NH 966B Kundannoor - Willington Island .
...
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