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The 5th, 8th and 11th Terms of a G.P. Are P, Q and S, Respectively. Show that Q2 = Ps. - Mathematics

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Question

The 5th, 8th and 11th terms of a G.P. are pq and s, respectively. Show that q2 = ps.

Solution

Let a be the first term and r be the common ratio of the G.P.

According to the given condition,

a5 = a r5–1 a r4 = p … (1)

aa r8–1 a r7 = q … (2)

a11 = a r11–1 a r10 = s … (3)

Dividing equation (2) by (1), we obtain

  Is there an error in this question or solution?
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APPEARS IN

 NCERT Solution for Mathematics Textbook for Class 11 (2018 (Latest))
Chapter 9: Sequences and Series
Q: 3 | Page no. 192
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Solution The 5th, 8th and 11th Terms of a G.P. Are P, Q and S, Respectively. Show that Q2 = Ps. Concept: Geometric Progression (G. P.).
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