Relations and Functions

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Question
CBSEENMA12032222

 Consider the following information regarding the number of men and women workers in three factories I. II and III

 

Men Workers

Women Workers

I

30

25

II

25

31

III

27

26

Represent the above information in the form of a 3 x 2 matrix. What does the entry in the third row and second column represent?

Solution

 

The given information is

Factory

Men Workers

Women Worker:

I

, 30

25

II

' 25

31

III

27

26

The information is represented in the form of a 3 X 2 matrix as follows :
A equals open square brackets table row 30 25 row 25 31 row 27 26 end table close square brackets
The entry in the third row and second column represents the number of women workers in factory III.
          straight A equals open square brackets table row 2 row 35 row cell square root of 3 end cell end table space table row 5 row cell negative 2 end cell row 1 end table table row 19 row cell 5 over 2 end cell row cell negative 5 end cell end table table row cell negative 7 end cell row 12 row 17 end table close square brackets. space write

 

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Question
CBSEENMA12032223

If a matrix has 24 elements, what are the possible orders it can have ? Wh'at. if it has 13 elements ?

Solution

We know that a matrix of order m x n has mn elements. Therefore, for finding all possible orders of a matrix with 24 elements, w e will find all ordered pairs with products of elements as 24.
∴ all possible ordered pairs are
(1, 24), (24. 1), (2, 12), (12. 2). (3, 8), (8, 3), (4. 6), (6, 4)
∴ possible orders are
1 x 24. 24 x 1, 2 x 12, 12 x 2, 3 x 8, 8 x 3, 4 x 6. 6 x 4
If number of elements  =13, then possible orders are 1 x 13, 13 x l.

Question
CBSEENMA12032224

lf a matrix has 18 elements, what are the possible orders it can have ? What, if it has 5 elements?

Solution

We know that a matrix of order m x n has mnelements. Therefore, for finding all possible orders of a matrix with 18 elements, we will find all ordered pairs with products of elements as 18
∴ all possible ordered pairs areall possible ordered pairs areall possible ordered pairs areall possible ordered pairs areall possible ordered pairs areall possible ordered pairs are
(I, 18). (18, 1). (2, 9). (9. 2). (3, 6). (0, 3)
∴ possible orders are 1 x 18. 18 x 1. 2 x 9,-9 X 2, 3 x 6. 6 x 3.
If number of elements = 5, then possible orders arc 1 x 5. 5 x I.

Question
CBSEENMA12032225

If a matrix A has 12 elements, what arc the possible orders it can have 7 What if it has 7 elements ?

Solution

Number of elements = 12
∴possible orders of the matrix are
1 x 12, 12 x 1,2 X 6. 6 x 2,3 x 4,4 x 3
If numbers of elements = 7, then possible orders are 1 x 7. 7 x 1