Seema posted an Question
April 22, 2020 • 21:34 pm 50 points
  • CSIR NET
  • Mathematical Sciences

Plz solve it

explain the steps I'm not getting proper answer.......

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    Ujjawal vishal best-answer

    option 1

    cropped239336553553982789.jpg
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    3rd is correct how???

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    ya sorry rank(B)= 4 here

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    here rank of B must be 4 if it is less than 4 then get contradiction to given rank of AB is 4

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    whatever I'm saying is correct???

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    yes.... since rank(B)≥rank(AB) So, rank of B cant be less than 4

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