GATE CSE
First time here? Checkout the FAQ!
x
0 votes
96 views

Is the answer and explaination given correct ?

asked in Linear Algebra by Junior (771 points)   | 96 views
Yes, its correct.
:-D gateforum has screwed up again...
Your answer is correct. They've given the explantion for the same but they've selected the wrong option.

@sushant my answer is correct or gf's, @kaushik the video explaination says the answer is 2. here is the link : https://d2h3n22tzbcxdg.cloudfront.net/172276/Videos/CS-ID-172276_R12.mp4

Ya A is the correct answer. They've given the explanation for the same.
Sorry i thought you selected A.
ok.. in there notes they have given answer as c... anyways thanks you both.
Rank of (AP) = Min (Rank A,Rank P) .But here P is non singular of order 4 i.e |P| not eq to 0. So rank of P is 4 only as it has non zero submatrix of order 4 and rank of A is 2 given. Hence rank of AP = 2.

Sorry, Answer is wrong but explanation is correct.  Rank doesnt change by pre/post-multiplication by non-singular matrix.

Please log in or register to answer this question.



Top Users Aug 2017
  1. ABKUNDAN

    4654 Points

  2. Bikram

    4016 Points

  3. akash.dinkar12

    3136 Points

  4. rahul sharma 5

    2832 Points

  5. manu00x

    2644 Points

  6. makhdoom ghaya

    2370 Points

  7. just_bhavana

    2040 Points

  8. Tesla!

    1742 Points

  9. pawan kumarln

    1574 Points

  10. learner_geek

    1554 Points


24,864 questions
31,941 answers
74,060 comments
30,062 users