Question

10th term of an arithmetic progression 2,-1,-4 is
1) -21 2)-23 3)-25 4)-27​

Answer 1

Answer:

I think in this question some symbol numbers are Missing write dear

Step-by-step explanation:

pls mark me as brainlist pls help me

Answer 2

Answer:

10th term of an arithmetic progression 2,-1,-4 is (-25)

So option (3) is the correct answer.

Step-by-step explanation:

Given series is 2,-1,-4,.....

First term of the series is 2 and common difference= (-1-2)=-3

Here we want to find 10 th term of the series.

We know,$a_n = a+(n-1)d$

Where $a_n$is nth term,a is first term,n is number of term and d is common difference.

Here,

$a = 2 \\ d = - 3 \\ n = 10$

So,

$a_{10} = 2 + (10 - 1) \times ( - 3) \\ = 2 + 9 \times ( - 3) \\ = 2 - 27 \\ = - 25$

Required 10th term is (-25).

Some others formula of AP series,

1.General from of Ap series-

a,a+d,a+2d,a+3d,.........a+nd.

2.Sum of nth term of AP series-$s = \frac{n}{2} [2a + (n - 1)d]$

3.Sum of all terms in a finite AP with the last term as "l"- $\frac{n}{2} (a + l)$

Know more about Arithmetic progression

1) https://brainly.in/question/4219484

2) https://brainly.in/question/2768711