English Grammar: Idioms

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അരിപ്പ  =തിരുവനന്തപുരം .
കടലുണ്ടി =മലപ്പുറം .
കുമരകം =കോട്ടയം .
ചൂളന്നൂർ = പാലക്കാട്‌ .
തട്ടേക്കാട്=ഏറണാകുളം .
മംഗളവനം =ഏറണാകുളം .
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Suppose there are n people in the party. The first person shakes hand with the other (n-1) guests. The second guest shakes hand with the other (n-2) guests. this will continue until the (n-1)-th guest shakes hand with the nth guest.

Total number of handshakes is (n-1) + (n-2).. + 3 + 2 + 1. .

= (n-1)(n)/2 .

For example, 6 people in a party shake hand with other guests. So how many handshakes will be there?.

=(6-1)(6)/2.

=15.

ഏതാനും പേര്‍ തമ്മില്‍ പരസ്പരം ഹസ്തദാനം നടത്തിയാല്‍ ആകെഹസ്തദാനങ്ങളുടെ എണ്ണംകാണുവാനുള്ള സൂത്രവാക്യമാണ്  (n-1)(n)/2 ഇവിടെ ' n ' എന്നത് ആളുകളുടെ എണ്ണമാണ്. ഉദാഹരണത്തിന് 6 പേര്...

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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...

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