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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Anonymous User Best Answer
check attachment 3
sir, I didn't understand this solution please clarify.
a.a^T=A If a=0 then rank of A =0 but it a≠0 then rank of A=1 rank of (P+aaT)≥|ranK(A)- rank(P)| when a=0 rank of (P+aaT)≥|0-4| =4 when a≠0 rank of (P+aaT)≥|1-4| =3 least value 3