Question

Without adding, Find the sum of 1+3+5+7+9​

Answer 1

Answer:

$\huge\bold\star\blue{Answer}\star$

the sum of 1 + 3 + 5 + 7 + 9 = 25

Answer 2

In accordance with the information provided in the question,

We have find the value of the supplied expression in the above question.

Given the data in question

the sum of 1+3+5+7+9​

As here,

1st term =1

2nd term =3

Common difference = 3 - 1 = 2

So, 9 will be 5th term,

So, value of n will be 5

So, Sum of term of AP having a = 1 as first term and difference = 2,

$S_n=\frac{n}{2}\times (a+l)\\=>S_n = \frac{5}{2}\times (9+1)\\=>S_n =\frac{5}{2}\times 10\\=>S_n=25$

Hence the required result will be $25$