Math, asked by ri8thasvitsama, 1 year ago

In an A.P. , if a = 1, an= 20 and sn =399, then n is?

Answers

Answered by srushti2

7

u can solve this in different manners and these is the one way.

Attachments:

Answered by adeeladilu2

3

ur answer is attached above.....

stay safe ND have a nice day.......

Attachments:

Previous Question

Next Question

Similar questions

English, 7 months ago

He __________ him every day ( meet ) use tense...

English, 7 months ago

$( \sqrt{7 - \sqrt{5) \sqrt{7 + \sqrt{5) \\ } } } }$ ...

Chemistry, 7 months ago

A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be broken into small particles by hammering. Which property of matter is illustrated by this observation?

Physics, 1 year ago

How does the angle of dip vary from equator to poles?

Psychology, 1 year ago

what is brainly? why we cant post more than two answers? who are mentors? who are moderators?who are brainly guru? who are the sage? who are administrators? what is the main function of brainly? how many contries it is used? how we get special ranks?

Physics, 1 year ago

when resultant force on a body is not zero then it produce...

Chemistry, 1 year ago

the element eka boron named by mendeleeve ia...

Biology, 1 year ago

Mitochondria Galvin bodies , cell wall, chloroplasts, nucleus are present in?