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2. Sequences and series of real numbers
Home · Class 10 · Maths · Ref. Book · 2. Sequences and series of real numbers
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Q4 of 110 Page 48

In a geometric sequence, the first term is and the sixth term is , find the G.P.


∵ an = a1rn-1 (n = no. of term, a1 = first term of G.P, r = common ratio)


⇒ a6 = a1r5


………(1)





Now, G.P will be-


⇒ a1, a1r, a1r2, a1r3,………




More from this chapter

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2

Find the 10th term and common ratio of the geometric sequence .

3

If the 4th and 7th terms of a G.P. are 54 and 1458 respectively, find the G.P.

5

Which term of the geometric sequence,

(i) 5, 2, … , is (ii) 1, 2, 4, 8,…, is 1024 ?

6

If the geometric sequences 162, 54, 18,…. and ,…have their nth term equal, find the value of n.

Questions · 110
2. Sequences and series of real numbers
1 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 1 1 1 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 1 1 1 1 1 1 2 2 3 4 5 6 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
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