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Grade: 12
        

how many words will be formed from IITJEE?

7 years ago

Answers : (2)

Aman Bansal
592 Points
							

Dear Rachita,

Basic Principles of Counting

Illustration:

How many 4-letter words can be formed using a, b, c, d, e

        (i) Without repetition                (ii) With repetition

Solution:

(i) The number of words that can be formed is equal to the number of ways to fill the three places.

                  Places:                                  table

       Number of Choices:                        5        4        3           2

        => 5 × 4 × 3 × = 120 words can be formed when repetition is not allowed.

(ii) The number of words that can be formed is equal to the number of was to fill the three places.

              Places:                                 table

     Number of Choices:                      5        5        5         5

First place can be filled in 5 ways. If repetition is allowed, all the remaining places can be filled in 5 ways each.

        => 5 × 5 × 5 × 5 = 625 words can be formed when repetition is allowed.

Exercise

1. 1 Plane, 2 trains and 3 buses ply between Delhi and Agra.

        (a) In how many ways can you to Agra from Delhi.

        (b) In how many ways can you go and come back if you go by train,

2. Total number of combinations of n dissimilar things, taken at least one at a time ________.

Ans.1 (a) 6,

         (b) 2 × = 12

2. 2n - 1

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Thanks

Aman Bansal

Askiitian Expert


7 years ago
gauhar singh
7 Points
							

identical letters cannot permute among themselves

therefore, 6!/2!x2!

6 years ago
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