मराठी

Find : Nth Term of the G.P. √ 3 , 1 √ 3 , 1 3 √ 3 , . . .

Advertisements
Advertisements

प्रश्न

Find : 

nth term of the G.P.

\[\sqrt{3}, \frac{1}{\sqrt{3}}, \frac{1}{3\sqrt{3}}, . . .\]

Advertisements

उत्तर

Here,

\[\text { First term, } a = \sqrt{3}\]

\[\text { Common ratio, } r = \frac{a_2}{a_1} = \frac{\frac{1}{\sqrt{3}}}{\sqrt{3}} = \frac{1}{3}\]

\[ \therefore \text { nth term } = a_n = a r^{(n - 1)} = \sqrt{3} \left( \frac{1}{3} \right)^{n - 1} \]

\[\text { Thus, the nth term of the given GP is } \sqrt{3} \left( \frac{1}{3} \right)^{n - 1} .\]

shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 20: Geometric Progression - Exercise 20.1 [पृष्ठ १०]

APPEARS IN

आर.डी. शर्मा Mathematics [English] Class 11
पाठ 20 Geometric Progression
Exercise 20.1 | Q 3.5 | पृष्ठ १०

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

Find the sum of the products of the corresponding terms of the sequences `2, 4, 8, 16, 32 and 128, 32, 8, 2, 1/2`


Find four numbers forming a geometric progression in which third term is greater than the first term by 9, and the second term is greater than the 4th by 18.


Show that one of the following progression is a G.P. Also, find the common ratio in case:1/2, 1/3, 2/9, 4/27, ...


Evaluate the following:

\[\sum^{11}_{n = 1} (2 + 3^n )\]


Find the sum of the following serie:

5 + 55 + 555 + ... to n terms;


How many terms of the sequence \[\sqrt{3}, 3, 3\sqrt{3},\]  ... must be taken to make the sum \[39 + 13\sqrt{3}\] ?


Find the sum of the following serie to infinity:

8 +  \[4\sqrt{2}\] + 4 + ... ∞


Prove that: (21/4 . 41/8 . 81/16. 161/32 ... ∞) = 2.


Find the rational numbers having the following decimal expansion: 

\[0 . \overline3\]


Find the rational numbers having the following decimal expansion: 

\[0 .\overline {231 }\]


Find an infinite G.P. whose first term is 1 and each term is the sum of all the terms which follow it.


Show that in an infinite G.P. with common ratio r (|r| < 1), each term bears a constant ratio to the sum of all terms that follow it.


If a, b, c are in G.P., prove that log a, log b, log c are in A.P.


If a, b, c are in G.P., prove that the following is also in G.P.:

a3, b3, c3


If xa = xb/2 zb/2 = zc, then prove that \[\frac{1}{a}, \frac{1}{b}, \frac{1}{c}\] are in A.P.

  

If a, b, c are in A.P., b,c,d are in G.P. and \[\frac{1}{c}, \frac{1}{d}, \frac{1}{e}\] are in A.P., prove that a, c,e are in G.P.


If a, b, c are three distinct real numbers in G.P. and a + b + c = xb, then prove that either x< −1 or x > 3.


The sum of an infinite G.P. is 4 and the sum of the cubes of its terms is 92. The common ratio of the original G.P. is 


If A be one A.M. and pq be two G.M.'s between two numbers, then 2 A is equal to 


Let x be the A.M. and yz be two G.M.s between two positive numbers. Then, \[\frac{y^3 + z^3}{xyz}\]  is equal to 


Check whether the following sequence is G.P. If so, write tn.

7, 14, 21, 28, …


The numbers 3, x, and x + 6 form are in G.P. Find 20th term.


The numbers x − 6, 2x and x2 are in G.P. Find 1st term


For the following G.P.s, find Sn.

p, q, `"q"^2/"p", "q"^3/"p"^2,` ...


If Sn, S2n, S3n are the sum of n, 2n, 3n terms of a G.P. respectively, then verify that Sn (S3n – S2n) = (S2n – Sn)2.


Determine whether the sum to infinity of the following G.P.s exist, if exists find them:

`2, 4/3, 8/9, 16/27, ...`


Determine whether the sum to infinity of the following G.P.s exist, if exists find them:

9, 8.1, 7.29, ...


Find : `sum_("n" = 1)^oo 0.4^"n"`


The midpoints of the sides of a square of side 1 are joined to form a new square. This procedure is repeated indefinitely. Find the sum of the perimeters of all the squares


Select the correct answer from the given alternative.

If common ratio of the G.P is 5, 5th term is 1875, the first term is -


Answer the following:

Find the sum of the first 5 terms of the G.P. whose first term is 1 and common ratio is `2/3`


Answer the following:

If for a G.P. first term is (27)2 and seventh term is (8)2, find S8 


Answer the following:

Find the sum of infinite terms of `1 + 4/5 + 7/25 + 10/125 + 13/6225 + ...`


If a, b, c, d are in G.P., prove that a2 – b2, b2 – c2, c2 – d2 are also in G.P.


In a G.P. of positive terms, if any term is equal to the sum of the next two terms. Then the common ratio of the G.P. is ______.


The third term of G.P. is 4. The product of its first 5 terms is ______.


If x, 2y, 3z are in A.P., where the distinct numbers x, y, z are in G.P. then the common ratio of the G.P. is ______.


The third term of a G.P. is 4, the product of the first five terms is ______.


If `e^((cos^2x + cos^4x + cos^6x + ...∞)log_e2` satisfies the equation t2 – 9t + 8 = 0, then the value of `(2sinx)/(sinx + sqrt(3)cosx)(0 < x ,< π/2)` is ______.


The sum of the first three terms of a G.P. is S and their product is 27. Then all such S lie in ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×