Ask Questions, Get Answers
Menu
X
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
studyplans
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
mobile
exams
ask
sample papers
tutors
pricing
sign-in
Download our FREE mobile app with 1000+ tests for CBSE, JEE MAIN, NEET
X
Search
Topics
Want to ask us a question?
Click here
Browse Questions
Student Questions
Ad
Home
>>
CBSE XII
>>
Math
>>
Matrices
0
votes
Assume $X, Y, Z, W$ and $P$ are matrices of order $2\times n$, $3\times k$, $2\times p$, $n\times 3$ and $p\times k$, respectively. If $n = p$ then the order of the matrix $7X - 5Z$ is:
$$ (A) \quad p \times 2 \qquad \qquad (B) \quad 2 \times n \qquad \qquad (C) \quad n \times 3 \qquad \qquad (D) \quad p \times n $$
cbse
class12
bookproblem
ch3
sec2
q22
p83
sec-a
math
Share
asked
Nov 25, 2012
by
pady_1
edited
Apr 1, 2016
by
pady_1
Please
log in
or
register
to add a comment.
Can you answer this question?
Do not ask me again to answer questions
Please
log in
or
register
to answer this question.
1 Answer
0
votes
Toolbox:
Multiplication of two matrices is defined only if the number of columns of the left matrix is the same as the number of rows of the right matrix.
The order of matrix X is $2\times n.$
The order of matrix Z is $2\times p.$
$7X-5Z$ can be defined only $X$ and $Z$ are of the same order, i.e, $n$ must equal $p$.
Thus the order of 7X-5Z is $2\times n$ or $2\times p$
(B) is the correct answer.
answered
Feb 14, 2013
by
sreemathi.v
edited
Mar 1, 2013
by
balaji.thirumalai
Please
log in
or
register
to add a comment.
Related questions
0
votes
1
answer
Assume $X, Y, Z, W$ and $P$ are matrices of order $2\times n, 3\times k, 2\times p, n\times 3$ and $p\times k$, respectively. The restriction on $n, p, k$ so that $PY + WY$ will be defined are:
asked
Nov 25, 2012
by
pady_1
cbse
class12
bookproblem
ch3
sec2
q21
p83
sec-a
math
0
votes
1
answer
The bookshop of a particular school has 10 dozen chemistry books, 8 dozen physics books, 10 dozen economics books. Their selling prices are Rs 80, Rs 60 and Rs 40 each respectively. Find the total amount the bookshop will receive from selling all the books using matrix algebra.
asked
Nov 25, 2012
by
pady_1
cbse
class12
bookproblem
ch3
sec2
q20
p83
medium
long-answer
sec-b
math
0
votes
0
answers
Assume X, Y, Z, W and P are matrices of order (2 x n), (3xk), (n x 3) and (p x k) respectively, then the restriction on n, k and p so that py + my will be defined are : (k=3, p=n)
asked
Jan 24, 2013
by
meena.p
cbse
class12
additionalproblem
kvquestionbank2012
ch3
q22
p8
math
sec-b
0
votes
1
answer
If $P$ is a $3\times 3$ matrix such that $P^T=2P+1$ where $P^T$ is the transpose of $p$ and $I$ is the $3\times 3$ identity matrix then there exists a column matrix $x=\begin{bmatrix}x\\y\\z\end{bmatrix}\neq \begin{bmatrix}0\\0\\0\end{bmatrix}$ such that
asked
Nov 20, 2013
by
sreemathi.v
jeemain
math
ch3
class12
matrices
q30
transpose-of-a-matrix
easy
0
votes
1
answer
If A is a matrix of order $3\times 3$,then number of minors in determinant of A are____________.
asked
Dec 28, 2012
by
sreemathi.v
cbse
class12
ch4
sec-a
q43
p83
fitb
exemplar
easy
math
0
votes
1
answer
If A is a matrix of order $3\times 3$,then $(A^2)^{-1}$=_____________.
asked
Dec 28, 2012
by
sreemathi.v
cbse
class12
ch4
sec-a
q42
p83
fitb
exemplar
easy
math
0
votes
1
answer
If A is invertible matrix of order $3\times 3$,then $| A^{-1} |$___________.
asked
Dec 27, 2012
by
sreemathi.v
cbse
class12
ch4
sec-a
q39
p83
fitb
exemplar
easy
math
Ask Question
Tag:
Math
Phy
Chem
Bio
Other
SUBMIT QUESTION
►
Please Wait
Take Test
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
5 Test Series
JEEMAIN
350+ TESTS
NEET
320+ TESTS
CBSE XI MATH
50+ TESTS
CBSE XII MATH
80+ TESTS
x
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...