Home
Class 12
MATHS
STATEMENT-1 : The sum of reciprocals of ...

STATEMENT-1 : The sum of reciprocals of first n terms of the series ` 1 + (1)/(3) + (1)/(5) + (1)/(7) + (1)/(9) + … "is" n^(2) ` and
STATEMENT-2 : A sequence is said to be H.P. if the reciprocals of its terms are in A.P.

A

Statemant-1 is True , Statement-2 is True, Statement -2 is a correct explanation for Statement-1

B

Statemant-1 is True , Statement-2 is True, Statement -2 is NOT a correct explanation for Statement-1

C

Statement-1 is True, Stetement-2 is False.

D

Statement-1 is False, Statement-2 is True

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze both statements provided and determine their validity. ### Step 1: Analyze Statement 1 **Statement 1:** The sum of reciprocals of the first n terms of the series \( 1 + \frac{1}{3} + \frac{1}{5} + \frac{1}{7} + \frac{1}{9} + \ldots \) is \( n^2 \). 1. The series given is the sum of the reciprocals of the first n odd numbers. 2. The first n odd numbers are \( 1, 3, 5, 7, \ldots, (2n - 1) \). 3. The reciprocals of these numbers are \( 1, \frac{1}{3}, \frac{1}{5}, \frac{1}{7}, \ldots, \frac{1}{(2n-1)} \). To find the sum of the reciprocals, we denote it as: \[ S_n = 1 + \frac{1}{3} + \frac{1}{5} + \ldots + \frac{1}{(2n - 1)} \] 4. It is known from mathematical results that: \[ S_n = \frac{n^2}{2} \] However, the statement claims \( S_n = n^2 \), which is incorrect. ### Step 2: Analyze Statement 2 **Statement 2:** A sequence is said to be H.P. if the reciprocals of its terms are in A.P. 1. This statement is true. By definition, a sequence is in Harmonic Progression (H.P.) if the reciprocals of its terms form an Arithmetic Progression (A.P.). ### Conclusion - **Statement 1** is **false** because the sum of the reciprocals of the first n odd numbers is \( \frac{n^2}{2} \), not \( n^2 \). - **Statement 2** is **true** as it correctly defines H.P. Thus, the final conclusion is that Statement 1 is false, and Statement 2 is true. ### Final Answer - **Statement 1:** False - **Statement 2:** True
Promotional Banner

Topper's Solved these Questions

  • SEQUENCES AND SERIES

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (SECTION - G) Integer|6 Videos
  • SEQUENCES AND SERIES

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (SECTION - H) True/False|3 Videos
  • SEQUENCES AND SERIES

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (SECTION - D) Linked Comprehension|11 Videos
  • RELATIONS AND FUNCTIONS

    AAKASH INSTITUTE ENGLISH|Exercise Assignment (Section - J) Aakash Challengers Questions|8 Videos
  • SETS

    AAKASH INSTITUTE ENGLISH|Exercise SECTION-I(Aakash Challengers Questions)|4 Videos

Similar Questions

Explore conceptually related problems

Sum to n terms of the series :1 + 2 (1 + (1)/(n)) + 3 (1 + (1)/(n )) ^(2) + ………

The sum of the n terms of the series 1+(1+3)+(1+3+5)+... is

Find the sum to n terms of the series: 1/(1. 3)+1/(3. 5)+1/(5. 7)+

Find the sum of first n term of a G.P. 1+(1)/(2)+(1)/(4)+(1)/(8)+...

Find the sum of the series to n terms and to infinity : (1)/(1.3)+ (1)/(3.5) +(1)/(5.7) +(1)/(7.9)+...

Write the first six terms of an A.P. in which a= 7 (1)/(2) , d= 1 (1)/(2)

Find the sum of first 25 terms of an A.P. whose nth term is 1- 4n

Prove that the sum of n terms of the reciprocals of the terms of the series a, ar, ar^(2),…" is "(1-r^(n))/(a(1-r)r^(n-1))

Find the sum of first n term of the A.P., whose nth term is given by (2n+1).

STATEMENT-1 : If a, b, c are distinct positive reals in G.P. then log_(a) n, log_(b) n, log_(c) n are in H.P. , AA n ne N and STATEMENT-2 : The sum of reciprocals of first n terms of the series 1 + (1)/(3) + (1)/(5) + (1)/(7) + (1)/(9) + ..... "is" n^(2) and