Question

1+ 3 + 5+7+ _______+25=_______.give me direct answer.​

Answer 1

Answer:

Then, since it is an A.P. series,

l=a+(n−1)d

n=

d

l−a

+1

=

2

25−1

+1

=

2

25−1+2

=

2

25+1

=

2

26

=13

Let S

n

be the sum of n=13 terms

∴S

n

=

2

n

×(a+l)

=

2

13

×(1+25)

=13×13=169.

So the required sum =169.

Step-by-step explanation:

i hope it's right

Answer 2

I hope this is your answer