Matrices and Determinants 2 Question 37

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41. If ap,bq,cr and pbc aqc abr

======= ####41. If ap,bq,cr and |pbcaqcabr|

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed

Then, find the value of ppa+qqb+rrc.

(1991,4M)

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Answer:

Correct Answer: 41. (2)

Solution:

  1. Let Δ=|pbcaqcabr|

Applying R1R2R1 and R3R3R1, we get

Δ=|pbcapqb0ap0rc|=c|apqbap0|+(rc)|pbapqb|=c(ap)(qb)+(rc)[p(qb)b(ap)]=c(ap)(qb)+p(rc)(qb)b(rc)(ap)

Since, Δ=0

c(ap)(qb)+p(rc)(qb)b(rc)(ap)=0crc+ppa+bqb=0

[on dividing both sides by (ap)(qb)(rc) ]

ppa+bqb+1+crc+1=2ppa+qqb+rrc=2



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