Ch 7(Permutation and Combination) Important Question Chapter wise

               Important Question

          Based on:-NCERT,CBSE, SUPPORT MATERIAL,QUESTION PAPER                                                                 ANALYSIS

                                                         M.                                                                          

                                               Chapter 7

                            Permutation and Combination

                              (From Previous year Question paper)

                 N.                                                                                                                    

Specific question (3-4 marks)

Que 1.

How many 5-digit telephone number can be constructed using the digits

0 to 9 if each number start with 67 and no digits appears more than once?

Solution:-

Que.2

Find r

I) 5^pr=2×6pr-1

II) 5^pr= 6pr-1

(Clear question written in pictures) 

Solution

So,r=3. (r≤n)

(II)

Solution:-

Que.3

Find the number of ways of selecting 9 balls from 6 red balls,5 white balls and 5 blue balls if each selection consist of 3 balls of each colour.

Solution:-

Que.4

A committee of 7 has to be formed from 9 boys and 4 girls. In how many ways can this

be done when the committee consists of:

(i) exactly 3 girls

(ii) at least 3 girls

(iii) almost 3 girls?

(Exercise- Miscellaneous of NCERT BOOK)

Que. 5

If the different permutations of all the letters of the word EXAMINATION are listed as

 in a dictionary, how many words are there in this list before the first word starting 

with E?

(Exercise- Miscellaneous of NCERT BOOK)

Que.6

Three married couples are to be seated in a row having six 

seats in a cinema hall. If spouses are to be seated next to each 

other, in how many ways can they be seated? Find also the 

number of ways of their seating if all the ladies sit together.

Que.7

In an election, these are ten candidates and four are to be 

elected. A voter may vote for any number of candidates, not 

greater than the number to be elected. If a voter vote for at least 

one candidate, then find the number of ways in which he can 

vote.

(All Questions are available in Google )

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