Need help understanding with finding partial sums.....

F

frauleinedoctor

Junior Member
Joined
Jan 9, 2009
Messages
61
These:

100

E 2i

i = 51


(supposed to look like a greek lettering E...)


The way that my teacher set up the problem for us in the example looked like this:


S sub 50 = 50/2 (51 + 100)



What I don't understand is why is 50 used instead of 51? I know there's a reason...
 
frauleinedoctor said:
These:

100

E 2i

i = 51


(supposed to look like a greek lettering E...)


The way that my teacher set up the problem for us in the example looked like this:


S sub 50 = 50/2 (51 + 100)



What I don't understand is why is 50 used instead of 51? I know there's a reason...

How many numbers are there "from 51 to 100" (including both the numbers)
Click to expand...
 
frauleinedoctor said:
Which IS including 51 and 100...
Click to expand...


Well no...it is NOT 49.

To convince your self of this fact, I suggest that this one time you write down all of the integers, starting with 51 and ending with 100...and ACTUALLY COUNT THEM!

In fact, it might have been a good idea to do that before you came here asking this question....
 
1 - 10 <<<< How many numbers?

11 - 20 <<<< How many numbers?

21 - 30 <<<< How many numbers?
.
.
.
91- 100 <<<< How many numbers?

Now tell me

51 - 100 <<<< How many numbers?
 
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