Find nth:child element in its parent using jQuery

jQuery API provides a selector ":nth-child" which allows to select particular child element from its parent. For example, if you want to select 2nd li element from the ul tag. See below code.
This code will find the 1st li element and makes it forecolor to "Red". For 2nd li element its green and for 3rd li element its blue.
   $('ul li:nth-child(1)').css('color', 'Red');
   $('ul li:nth-child(2)').css('color', 'Green');
   $('ul li:nth-child(3)').css('color', 'blue');

This selector accepts four different values.
  1. index:Selects a single column with the specified numeric index. Remember, with :nth-child function the index starts from 1.
    $('ul li:nth-child(1)').css('color', 'Red');
  2. even:This option selects all the even child element in the parent.
    $('ul li:nth-child(even)').css('color', 'blue');
  3. odd:This option selects all the odd child element in the parent.
    $('ul li:nth-child(odd)').css('color', 'blue');
  4. equation:equation could be a*n or a*n + b where a and b both can be +ve or -ve value. n represents the column index. Below code will select items like 3,6,9 etc...
    $('ul li:nth-child(3n)').css('color', 'blue');
    Below code will splits the elements in group with size of 3 and selects 1 element in that list.
    $('ul li:nth-child(3n+1)').css('color', 'blue');
    both a and b are optional, but at least one should be provided.
You can also use this function with table tag. Below code finds 3rd td of table with id "tbl".
$('#tbl tr td:nth-child(3)').css('color', 'Red');
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