If a, b, c are in G.P. show that (1/a), (1/b), (1/c) are also in G.P.

(i) If a, b, c are in G.P. show that \frac { 1 }{ a } ,\frac { 1 }{ b } ,\frac { 1 }{ c } are also in G.P.
(ii) If K is any positive real number and Ka, Kb Kc is three consecutive terms of a G.P., prove that a, b, c are three consecutive terms of an A.P.
(iii) If p, q, r are in A.P., show that pth, qth and rth terms of any G.P. are themselves in GP.

Solution:

ML Aggarwal Class 10 Solutions for ICSE Maths Chapter 9 Arithmetic and Geometric Progressions Ex 9.4

ML Aggarwal Class 10 Solutions for ICSE Maths Chapter 9 Arithmetic and Geometric Progressions Ex 9.4

If a, b, c are in GP., prove that the following are also in G.P.
(i) a3, b3, c3
(ii) a2 + b2, ab + bc, b2 + c2.

Solution:

ML Aggarwal Class 10 Solutions for ICSE Maths Chapter 9 Arithmetic and Geometric Progressions Ex 9.4

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