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Q2(iii):
Write first four terms of the AP, when the first term $a$ and the common difference $d$ are given as follows: (iii) $a = 4, d = – 3$

Solution :

Given:

The first term of the Arithmetic Progression (AP), denoted by $a = 4$.

The common difference of the Arithmetic Progression, denoted by $d = -3$.

To Find:

The first four terms of the Arithmetic Progression ($a_1, a_2, a_3, a_4$).


Theoretical Basis:

An Arithmetic Progression is a sequence of numbers such that the difference between any two consecutive terms is constant. This constant is called the common difference ($d$).

The general form of an AP is given by: $a, (a + d), (a + 2d), (a + 3d), \dots$

Where:

  • $a_1 = a$
  • $a_2 = a + d$
  • $a_3 = a + 2d$
  • $a_4 = a + 3d$

Step 1: Calculating the first term ($a_1$)

By definition, the first term is simply $a$.

$a_1 = a = 4$


Step 2: Calculating the second term ($a_2$)

Using the formula $a_2 = a + d$:

$a_2 = 4 + (-3)$

$a_2 = 4 - 3$

$a_2 = 1$


Step 3: Calculating the third term ($a_3$)

Using the formula $a_3 = a + 2d$:

$a_3 = 4 + 2(-3)$

$a_3 = 4 + (-6)$

$a_3 = 4 - 6$

$a_3 = -2$


Step 4: Calculating the fourth term ($a_4$)

Using the formula $a_4 = a + 3d$:

$a_4 = 4 + 3(-3)$

$a_4 = 4 + (-9)$

$a_4 = 4 - 9$

$a_4 = -5$


Summary of Terms:

Term Calculation Value
$a_1$ $a$ $4$
$a_2$ $a + d$ $1$
$a_3$ $a + 2d$ $-2$
$a_4$ $a + 3d$ $-5$

Final Answer: The first four terms of the Arithmetic Progression are 4, 1, -2, and -5.


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

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