Combinations and Permutations
Combinations and Permutations
Click here to view more Kerala PSC Study notes.
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.
NSS ഗീതം ഏതാണ്? - മനസ്സു നന്നാവട്ടെ എന്നു തുടങ്ങുന്ന ഗാനം .
NSS ആരംഭിച്ചത് ഏതു വർഷം? - 1969.
NSS ഉദ്ഘാടനം ചെയ്തത് എന്നായിരുന്നു? - 1969 സെപ്റ്റംബർ 24.
NSS എന്നതിന്റെ പൂർണ്ണരൂപം എന്താണ്? - National Service Scheme.
NSS ഔപചാരികമായി ഉദ്ഘാടനം ചെയ്തതാര്? - വി കെ ആർ റാവു (1969).
NSS ചിഹ്നത്തിലെ 8 അരക്കാലുകൾ എന്തിനെയാണ് സൂചിപ്പിക്കുന്നത്? - ഒരു ദിവസത്തിലെ എട്ടു യാമങ്ങളെ .
NSS ചിഹ്നത്തിലെ ചക്രം എന്തിനെയാണ് സൂ...
The questions about Andhra Pradesh and Assam are provided below. .
ആന്ധ്രാപ്രദേശ് .
അമരജീവി എന്നറിയപ്പെട്ട നേതാവാണ്‌ പോറ്റി ശ്രീരാമലു.
ആധുനിക ആന്ധ്രയുടെ പിതാവ്‌ എന്നറിയപ്പെട്ടത്‌.- വീരേശലിംഗം.
ആന്ധയിലെ രാജാറാം മോഹന്‍ റോയ്‌ എന്ന്‌ വിശേഷിക്കപ്പെട്ടത്‌- വിരേശലിംഗം.
ആന്ധ്ധാപ്രദേശിന്റെ വ്യാപാര തലസ്ഥാനം- വിജയവാഡ.
ആന്ധ്ധാപ്രദേശിന്റെ സാംസ്‌കാരിക തലസ്ഥാനം എന്നറിയപ്പെടുന്നത്‌- രാജമുന...
Coronaviruses are a group of related RNA viruses that cause diseases in mammals and birds. In humans and birds, they cause respiratory tract infections that can range from mild to lethal. Mild illnesses in humans include some cases of the common cold (which is also caused by other viruses, predominantly rhinoviruses), while more lethal varieties can cause SARS, MERS, and COVID-19. .
Coronavirus disease 2019 (COVID-19) is a contagious disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first known case was identified in Wuhan, China in December 2019.[7] The disease has since spread worldwide, leading to an ongoing pandemic. Symptoms of COVID-19 are variable, but often include fever, cough, headache, fatigue, breathing difficulties, and loss of smell and taste. Transmission of COVID-19 occurs when people are exposed to virus-containing respiratory droplets and airborne particles exhaled by an infected person. Those particles may be inha...
Click here to Search
Secretariat Assistant Syllabus 2021
LDC Syllabus 2022
Tenth Level Mains Syllabus
Secretariat Assistant Previous Question paper
Secretariat Assistant Syllabus 2021
10th level Preliminary Exam Previous Year Question Paper
LDC Previous Question papers
LGS Previous Question papers
Village Field Assistant Previous Question papers
Preliminary Exam Answer key 2021
Fireman Previous year Question Papers
UPSA Previous Question papers
LPSA Previous Question papers
PSC Questions and Answers
Kerala PSC Exam Calendar