Ask Ghassem - Recent questions tagged combination

Which scenarios among the following are a valid reason to use regularization?

Sat, 27 Oct 2018 17:31:43 +0000

A. To drop the least useful variables of a model

B. To reduce over-fitting

C. To reduce the bias of a model

D. To decrease p-value

How do you tell a permutation problem from a combination problem?

Mon, 15 Oct 2018 15:34:13 +0000

Given the questions:

1. How many different groups of 4 students can be made from a class of 40?

and

2. How many different lists of 4 students can be made from a class of 40?

How do you determine which requires a permutation and which requires a combination?

What is the difference between permutation and combination?

Sat, 13 Oct 2018 01:19:28 +0000

What is binomial experiment and when do we use it?

Fri, 12 Oct 2018 22:25:59 +0000

When should we use permutation and combination?

Fri, 12 Oct 2018 22:16:45 +0000

Sample question of permutation and combination.

Fri, 12 Oct 2018 20:47:03 +0000

You can bring along 2 friends! you have 5 friends who want to come along. How many different groups of friends could you take with you?

What is the difference between Combination and Permutation?

Thu, 11 Oct 2018 17:25:28 +0000

As an example:
Calculate the possible permutations for a rubik's cube?

Why is it not, calculate the possible combinations for a rubik's cube?

Six devices (A,B,C,D,E, F) are each assigned one of three IP addresses...how many different assignments are possible?

Mon, 08 Oct 2018 21:46:42 +0000

Six devices (A,B,C,D,E, F) are each assigned one of three IP addresses (IP#1, IP#2, IP#3). If three
devices are assigned IP#1, two devices are assigned IP#2, and one device IP#3, how many different
assignments are possible?

This is question 4 from lecture 3A.

How many different ways are there to deal four 13 card hands to four players from a standard deck of 52 cards?

Mon, 08 Oct 2018 18:58:32 +0000

This question is from the third Combination example from lecture notes 3A. Researching this question I found this answer

https://www.quora.com/In-how-many-ways-can-52-cards-be-distributed-to-four-players-with-13-cards-each

What I don't understand is why you multiple the number of ways for each hand as opposed to adding. I know for player 1 it's C(52,13), player 2 C(39,13), player 3 C(26,13), then player 4 is 1 or C(13,13). I thought adding these together would get the total number of ways to deal the cards. Is this answer from the link correct and why?