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Question

Let three matrices A = [2141];B=[3423]andC=[3423] then
tr(A)+tr(ABC2)+tr(A(BC)24)+tr(A(BC)38)+....+

A
6
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B
9
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C
12
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D
none of these
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Solution

The correct option is C 6
Let S=tr(A)+tr(ABC2)+tr(A(BC)24)+tr(A(BC)38)+....+

BC=[3423][3423]=[1001]

S=tr(A)+tr(A2)+tr(A4)+....

tr(A)=2+1=3

S=3+32+34+....

The sum of infinite terms of a GP series is S=a(1r)

S=3⎜ ⎜ ⎜1112⎟ ⎟ ⎟=6

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