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# Solution for If A, B, C Are in A.P,; B, C, D Are in G.P and  1/C, 1/D,1/E Are in A.P. Prove That A, C, E Are in Geometric Progression - CBSE (Arts) Class 11 - Mathematics

ConceptGeometric Progression (G. P.)

#### Question

If a, b, c are in A.P,; b, c, d are in G.P and  1/c, 1/d,1/e are in A.P. prove that a, c, e are in G.P.

#### Solution

It is given that abc are in A.P.

∴ b – a = c – b … (1)

It is given that bcd, are in G.P.

∴ c2 = bd … (2)

Also   1/c, 1/d,1/e are in A.P.

Thus, ac, and e are in G.P.

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Mathematics Textbook for Class 11 (2013 to Current)
Chapter 9: Sequences and Series
Q: 20 | Page no. 200
Solution If A, B, C Are in A.P,; B, C, D Are in G.P and  1/C, 1/D,1/E Are in A.P. Prove That A, C, E Are in Geometric Progression Concept: Geometric Progression (G. P.).
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