HOW TO SOLVE COMBINATIONS-LEARN SERIES

Hi Bankersdaily Aspirants,

Aspirants,You all know that IBPS RRB Exams are  heading soon,we are all in the Preparation of the Exams.Aspirants,”you will attain your destination in a short span of time if you work smarter than harder”.Aspirants,I think you all the Pattern of the exam,If you don’t know that’s not a Problem know it now,

 

EXAM PATTERN OF IBPS RRB 2017 – OFFICE ASSISTANTS AND SCALE I , II & III OFFICERS

Aspirants you all know that,to increase the score in Competitive exam we should choose the topic which we can solve in just 2 seconds,Today we are going to discuss Problems based on Combinations,Combination is one among the easiest topic.There will be 1 or 2 questions from Combination in the exam.

 

INTRODUCTION TO COMBINATION:

Combination is used when the order doesn’t matter.

Eg: Think of fruit salad which contains fruits such as apple,banana,grapes etc where we doesn’t feel about the order.This is known as Combination

It is denoted as 

TYPE 1:

1.Five people are in a club, Three are going to be in Planning Committee. How many different ways are needed to form a committee?

Explanation:

2.Over the weekend, your family is going on vacation, and your mom is letting you bring your favourite video game console as well as five of your games.How many ways can you choose the five games if you have 12 games in all?

Explanation:

COMBINATON WITH SOME RESTRICTION:

A committee of 5 people is to be chosen from a group of 6 men and 4 women. How many committees are possible if

  1. a) there are no restrictions?
  2. b) one particular person must be chosen on the committee?
  3. c) one particular woman must be excluded from the committee?

A)If there are no restriction:

Explanation:

Then the number ways the committee will be formed is:

b)One Particular Person must be chosen on the committee:

Explanation:

=1*9C4  =126 ways.

c)One Particular woman must be excluded from the committee:

Explanation:

=9C5=126 ways

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