default_background

Find the best tutors and institutes for Class 10 Tuition

Find Best Class 10 Tuition

Please select a Category.

Please select a Locality.

No matching category found.

No matching Locality found.

Q4(viii):
Which of the following are APs ? If they form an AP, find the common difference $d$ and write three more terms. (viii) $-\frac{1}{2}, -\frac{1}{2}, -\frac{1}{2}, -\frac{1}{2}, . . .$

Solution :

Given: A sequence of numbers: $-\frac{1}{2}, -\frac{1}{2}, -\frac{1}{2}, -\frac{1}{2}, \dots$

To Find:
1. Determine if the given sequence forms an Arithmetic Progression (AP).
2. If it forms an AP, find the common difference ($d$).
3. Write the next three terms of the sequence.

Step 1: Definition of an Arithmetic Progression
An Arithmetic Progression is a sequence of numbers in which the difference between any two consecutive terms is constant. This constant difference is called the common difference ($d$).
Let the terms of the sequence be represented as $a_1, a_2, a_3, a_4, \dots$
The sequence is an AP if $(a_2 - a_1) = (a_3 - a_2) = (a_4 - a_3) = d$.

Step 2: Calculating the differences between consecutive terms
Given terms: $a_1 = -\frac{1}{2}$, $a_2 = -\frac{1}{2}$, $a_3 = -\frac{1}{2}$, $a_4 = -\frac{1}{2}$.

Difference $d_1 = a_2 - a_1 = (-\frac{1}{2}) - (-\frac{1}{2}) = -\frac{1}{2} + \frac{1}{2} = 0$
Difference $d_2 = a_3 - a_2 = (-\frac{1}{2}) - (-\frac{1}{2}) = -\frac{1}{2} + \frac{1}{2} = 0$
Difference $d_3 = a_4 - a_3 = (-\frac{1}{2}) - (-\frac{1}{2}) = -\frac{1}{2} + \frac{1}{2} = 0$

Step 3: Verification and Conclusion on AP
Since $d_1 = d_2 = d_3 = 0$, the difference between consecutive terms is constant.
[Since the common difference is constant, the sequence forms an Arithmetic Progression.]
The common difference $d = 0$.

Step 4: Finding the next three terms
To find the next terms, we add the common difference $d$ to the last known term.
Let the next three terms be $a_5, a_6,$ and $a_7$.

$a_5 = a_4 + d = -\frac{1}{2} + 0 = -\frac{1}{2}$
$a_6 = a_5 + d = -\frac{1}{2} + 0 = -\frac{1}{2}$
$a_7 = a_6 + d = -\frac{1}{2} + 0 = -\frac{1}{2}$

Final Answer: The sequence forms an AP with common difference $d = 0$. The next three terms are $-\frac{1}{2}, -\frac{1}{2}, -\frac{1}{2}$.


More Questions from Class 10 Mathematics Arithmetic Progression EXERCISE 5.1


CBSE Solutions for Class 10 Mathematics Arithmetic Progression


Chapters in CBSE - Class 10 Mathematics


Other Subjects in CBSE - Class 10

Worksheet Icon

Download free CBSE - Class 10 Mathematics Arithmetic Progression EXERCISE 5.1 worksheets

Download Now

Find Best Class 10 Tuition ?

Find Now »