Question

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find the sum of 1+3+5+ ...............+25

Answer 1

Answer:

The sum is

13 square.

13×13= 169

Answer 2

Answer:

169

Step-by-step explanation:

We are given with 1+3+5+ ...............+25, which is an AP with a=1 and d=2

First, we find out the number of terms in the AP

we use the formula a(n)=a+(n-1)d

using this formula we get n=13

now, we calculate the sum of the AP using the formula s(n)=n/2(2a+(n-1)d) and obtain the answer as 169