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(1) Whats the difference between Permutations and combination?

Consider the following scenario - We go to Nanbu 🏠 and Nabu decides to play a game - The participants are Raags, Saro and Koch - Nanbu asking us to stand us in Permutations and Combination orders... (permutations and combination order of 2's) ->   i.e., different ways the 2 people out of 3 can be permutated and combinated ) Permutations: Total Entries:             Raags,Koch,Saro Total Permutations of 2: (Standing position) {Raags,Koch} {Raags,Saro}  {Koch,Saro} {Koch,Raags}  {Saro,Koch}  {Saro,Raags}   Total Combinations of 2: {Raags,Koch}  {Raags,Saro}  {Koch,Saro} Basic Overview: Order matters the most in Permutations Order does not matter in combination
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(2) What is mean, median and mode? Real time example to understand the concept

Mean, median and mode are measures to find the center value. Following are Number of kilometers for 1 week of my walking(Rounded to nearest integer). Day 1: 11 Day 2:0 Day 3:5 Day 4:5 Day 5:7 Day 6:8 Day 7:6 Mean: Sum = 42 Number of values(n) = 7 Mean = sum/n = (42/7) = 6 Median: Sorted values: [0,5,5,6,7,8,11] Median is at the position:(7+1)/2 = 4 4th value in the sorted values.(middle value) Median = 6 Mode: Mode = 5 (Most frequent number) What is the median if n is even? If n is even then median is the mean of values at the position(n/2 and (n/2) +1) Day 8:5 Then sorted values: [0,5,5,5,6,7,8,11] n/2 = 8/2 = 4 (n/2)+1 = 5 Then median is mean of 5 and 6 Median = 11/2 = 5.5
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