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Q1(i):
Fill in the blanks in the following table, given that $a$ is the first term, $d$ the common difference and $a_n$ the $n$th term of the AP: (i) $a=7, d=3, n=8, a_n=...$

Solution :

Given:

  • First term of the Arithmetic Progression ($a$) = $7$
  • Common difference ($d$) = $3$
  • Number of terms ($n$) = $8$

To find:

  • The $n$th term of the Arithmetic Progression ($a_n$)

Step 1: Identifying the relevant formula

For any Arithmetic Progression (AP), the $n$th term ($a_n$) is calculated using the standard formula:

$a_n = a + (n - 1)d$

[Where $a$ is the first term, $n$ is the position of the term, and $d$ is the common difference between consecutive terms.]


Step 2: Substituting the given values into the formula

Substitute $a = 7$, $d = 3$, and $n = 8$ into the formula:

$a_8 = 7 + (8 - 1) \times 3$


Step 3: Performing the arithmetic operations

Following the order of operations (PEMDAS/BODMAS):

First, solve the expression within the parentheses:

$a_8 = 7 + (7) \times 3$

[Since $8 - 1 = 7$]


Next, perform the multiplication:

$a_8 = 7 + 21$

[Since $7 \times 3 = 21$]


Finally, perform the addition:

$a_8 = 28$


Final Answer: The value of the 8th term ($a_n$) is 28.


More Questions from Class 10 Mathematics Arithmetic Progression EXERCISE 5.2


CBSE Solutions for Class 10 Mathematics Arithmetic Progression


Chapters in CBSE - Class 10 Mathematics


Other Subjects in CBSE - Class 10

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