Matrices and Determinants 2 Question 33

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37. Find the value of the determinant |bccaab pqr 111|, where a,b and c are respectively the p th, q th and r th terms of a harmonic progression.

======= ####37. Find the value of the determinant |bccaabpqr111|, where a,b and c are respectively the p th, q th and r th terms of a harmonic progression.

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed

(1997C, 2M)

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Answer:

Correct Answer: 37. (0)

Solution:

  1. Since, a,b,c are p th, q th and r th terms of HP.

1a,1b,1c are in an AP. 

1a=A+(p1)D

1b=A+(q1)D

1c=A+(r1)D ….(i)

Let Δ=|bccaabpqr111|=abc|1a1b1cpqr111|

=abc|A+(p1)DA+(q1)DA+(r1)Dpqr111|

Applying R1R1(AD)R3DR2

=abc|000pqr111|0|bccaabpqr111|=0



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