Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1   Report Post  
kidd
 
Posts: n/a
Default Need Formula Help


I am trying to make a formula that adds the amount at 200 and then the
amount if it double and triples without a limit.

Example: 1=200 /2 = 200+400/ 3 = 200+400+600/ 4 = 200+400+600+800 / 5
= 200+400+600+800+1000/ 6 = 200+400+600+800+1000+1200

If they enter in A1 the number 4

then in C1 then answer should be 2000

If they enter in A1 the number 6
then in C1 the answer should be 4200

Can anyone HELP ME PLEASE


--
kidd
------------------------------------------------------------------------
kidd's Profile: http://www.excelforum.com/member.php...o&userid=15799
View this thread: http://www.excelforum.com/showthread...hreadid=200316

  #2   Report Post  
garfield-n-odie
 
Posts: n/a
Default

Hi, kidd. You are describing an arithmetic series in the form of
n*(n+1)*100. So if the value n is in cell A1, then the formula in C1 would
be =A1*(A1+1)*100.

"kidd" wrote:


I am trying to make a formula that adds the amount at 200 and then the
amount if it double and triples without a limit.

Example: 1=200 /2 = 200+400/ 3 = 200+400+600/ 4 = 200+400+600+800 / 5
= 200+400+600+800+1000/ 6 = 200+400+600+800+1000+1200

If they enter in A1 the number 4

then in C1 then answer should be 2000

If they enter in A1 the number 6
then in C1 the answer should be 4200

Can anyone HELP ME PLEASE


--
kidd
------------------------------------------------------------------------
kidd's Profile: http://www.excelforum.com/member.php...o&userid=15799
View this thread: http://www.excelforum.com/showthread...hreadid=200316


  #3   Report Post  
Myrna Larson
 
Posts: n/a
Default

What you have are describing is (the sum of digits from 1 to N) * 200.

The equation for the sum of the digits is (N+1)*N/2.

The logic is very clever. Create pairs by selecting 2 numbers from the
original N values, but don't do it at random: do it by pairing 1 with N, 2
with N - 1, 3 with N - 2, etc.

Note that the sum of each pair is N + 1 (e.g. 5 + N - 4 = N + 1)

So, if you know how many pairs there are, the total is (N+1) * number of
pairs. The number of pairs = N/2.

So the sum of the digits from 1 through N, inclusive is (N+1)*N/2

If you put N in cell C1, the formula for A1 is

=200*C1/2*(1+C1)


On Wed, 27 Oct 2004 19:38:04 -0500, kidd
wrote:


I am trying to make a formula that adds the amount at 200 and then the
amount if it double and triples without a limit.

Example: 1=200 /2 = 200+400/ 3 = 200+400+600/ 4 = 200+400+600+800 / 5
= 200+400+600+800+1000/ 6 = 200+400+600+800+1000+1200

If they enter in A1 the number 4

then in C1 then answer should be 2000

If they enter in A1 the number 6
then in C1 the answer should be 4200

Can anyone HELP ME PLEASE


  #4   Report Post  
kidd
 
Posts: n/a
Default


garfield-n-odie thanks SO MUCH YOUR THE BEST :)


--
kidd
------------------------------------------------------------------------
kidd's Profile: http://www.excelforum.com/member.php...o&userid=15799
View this thread: http://www.excelforum.com/showthread...hreadid=200316

  #5   Report Post  
kidd
 
Posts: n/a
Default


I have my entire file now complete and everything work perfectly but I
need this to be on the web where people enter 2 numbers in 2 cells and
then the rest is figured out for them. When I save as webpage it shows
up but no one can enter text in the 2 cells I need them too. Can anyone
help????


--
kidd
------------------------------------------------------------------------
kidd's Profile: http://www.excelforum.com/member.php...o&userid=15799
View this thread: http://www.excelforum.com/showthread...hreadid=200316

Reply
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
revert formula insertion to old method Don't be a pain in the ass Setting up and Configuration of Excel 0 January 24th 05 02:49 PM
Help with a formula Richard F Excel Discussion (Misc queries) 1 January 20th 05 10:56 PM
Simple formula doesn't quite add up circeo Excel Discussion (Misc queries) 3 January 17th 05 10:04 PM
how do I make a formula NOT change when the data range is moved? Alida Andrews Excel Discussion (Misc queries) 2 January 6th 05 10:02 PM
Converting an Excel formula to an Access query formula Adam Excel Discussion (Misc queries) 1 December 15th 04 04:38 AM


All times are GMT +1. The time now is 02:56 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 ExcelBanter.
The comments are property of their posters.
 

About Us

"It's about Microsoft Excel"