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Let P=[(1,0,0),(3,1,0),(9,3,1)] and Q = ...

Let `P=[(1,0,0),(3,1,0),(9,3,1)]` and Q = `[q_(ij)]` be two `3xx3` matrices such that `Q - P^(5) = I_(3)`. Then `(q_(21)+q_(31))/(q_(32))` is equal to

A

52

B

103

C

201

D

205

Text Solution

Verified by Experts

The correct Answer is:
B
`P^(2)=[(1,0,0),(4,1,0),(16,4,1)][(1,0,0),(4,1,0),(16,4,1)]=[(1,0,0),(8,1,0),(48,8,1)]`
`P^(3)=[(1,0,0),(8,1,0),(48,8,1)][(1,0,0),(4,1,0),(16,4,1)]=[(1,0,0),(12,1,0),(96,12,1)]`
`:. P^(n)=[(1,0,0),(4n,1,0),(8(n^(2)+n),4n,1)]`
`:. P^(50)=[(1,0,0),(200,1,0),(8xx50/951),200,1)]`
`P^(50)-Q=I`
`:.` Equating w get
`200-q_(21)=0implies q_(21)=200`
`400xx51-q_(31)=0`
`implies q_(31)=400xx51`
`200-q_(32)=0 implies q_(32)=200`
`implies (q_(31)+q_(32))/q_(21)=(400xx51+200)/(200) =2(51)+1=103`
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