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(vii):
Which of the following are APs ? If they form an AP, find the common difference $d$ and write three more terms. (vii) 0, – 4, – 8, –12, . . .

Solution :

Given: A sequence of numbers: $0, -4, -8, -12, \dots$

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
A sequence $a_1, a_2, a_3, \dots, a_n$ is said to be an Arithmetic Progression if the difference between consecutive terms remains constant. This constant difference is called the common difference ($d$), defined as:
$d = a_{n} - a_{n-1}$ for all $n > 1$.

Step 2: Calculating differences between consecutive terms
Let the given terms be:
$a_1 = 0$
$a_2 = -4$
$a_3 = -8$
$a_4 = -12$

Calculate the differences:
Difference 1 ($d_1$): $a_2 - a_1 = -4 - 0 = -4$
Difference 2 ($d_2$): $a_3 - a_2 = -8 - (-4) = -8 + 4 = -4$
Difference 3 ($d_3$): $a_4 - a_3 = -12 - (-8) = -12 + 8 = -4$

Step 3: Verification of AP
[Since $d_1 = d_2 = d_3 = -4$, the difference between consecutive terms is constant.]
Therefore, the given sequence forms an Arithmetic Progression with a common difference $d = -4$.

Step 4: Finding the next three terms
To find the next terms, we add the common difference ($d = -4$) to the last known term ($a_4 = -12$).
Let the next three terms be $a_5, a_6,$ and $a_7$.

Calculation for $a_5$:
$a_5 = a_4 + d = -12 + (-4) = -16$

Calculation for $a_6$:
$a_6 = a_5 + d = -16 + (-4) = -20$

Calculation for $a_7$:
$a_7 = a_6 + d = -20 + (-4) = -24$

Final Answer:
The sequence forms an AP.
The common difference $d = -4$.
The next three terms are -16, -20, -24.


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 »