Question

find the sum of the sequence
46+47+48+49+...+123

Answer 1

this is as far as i have gotten..i know i add the first and last numbers together 46+123=189

Answer 2

then do i see if anymore add up to 189

Answer 3

there is a formula for this where the addition of all the numbers are \[S _{n}\]

Answer 4

give me a sec to remember it

Answer 5

im trying to understand the directions and its just not clicking to me.

Answer 6

\[S _{n} = (n/2)(2a + (n-1)d)\]

Answer 7

oh lord i have no idea lol

Answer 8

Therefore \[S _{123} - S _{45}\]
Will give you your answer

Answer 9

you've never seen that formulae? Have you ever done the topics Arithmetic Progression (AP) or GP?

Answer 10

the examples ive been going by doesnt show that. nope i havent gotten that far lol

Answer 11

lol ok ill see if i can tone it down a bit haha XD

Answer 12

ive passed all my other math classes with good grades but this math class i gotta feeling im not gonna do well at all

Answer 13

but i dont believe i was ever taught any other different method :/

Answer 14

u can teach u the formulae and u canjust use it and hope for the best? :P

Answer 15

Its the Gauss method.. i know its something like if you turned it around like 123+...49+48+47 etc it would be the same

Answer 16

ill see if i can get someone who knows the method, sry but that isnt on my syllabus

Answer 17

oh oh ok so when i stack them i find that when i add them i get 169 over

Answer 18

i ment stack like adding them..but on the second line I am going backwards..like..
123+122+121+120...

Answer 19

still sounds very tedious

Answer 20

is the answer 8450?

Answer 21

nope thats not right ugghhh

Answer 22

i can solve it for u, useing my method and i hope that atleast helps

Answer 23

yea let me see if i can do it that way. I was looking at the video but it just aint working

Answer 24

yeah, thts wat i got @HawkCrimson

Answer 25

@HawkCrimson

Answer 26

@HawkCrimson

Answer 27

u know the method he's talking about?

Answer 28

yea it's very interesting... @HawkCrimson

Answer 29

@HawkCrimson

Answer 30

@HawkCrimson

Answer 31

@HawkCrimson

Answer 32

the way i understood it from my text that is if you turn it around and added the numbers together (but descending order) you would get the same answer across..thats how I got 169. then you halfed that by dividing by 2 and thats how I got 8450. but its to damn confusing for me

Answer 33

6591? dont ask me how i got it..dont ask me to show you lolol cause i have nooooo clue lol

Answer 34

ill work it out now

Answer 35

The answer is 6591, so yes, u r correct :)

Answer 36

just try to be able to show working when u r being marked lol

Answer 37

yeah thts wat i got @HawkCrimson

Answer 38

@HawkCrimson

Answer 39

nice :)

Answer 40

thxs:D

Answer 41

@HawkCrimson

Answer 42

@HawkCrimson

Answer 43

beautiful and smart ;)

Answer 44

Nostrils and donuts ;)

Answer 45

@HawkCrimson

Answer 46

@HawkCrimson

Answer 47

@HawkCrimson

Answer 48

wat :P

Answer 49

@HawkCrimson

Answer 50

@LizzyLove<3

Answer 51

@LizzyLove<3

Answer 52

@HawkCrimson

Answer 53

@HawkCrimson

Answer 54

@HawkCrimson

Answer 55

@HawkCrimson

Answer 56

@HawkCrimson

Answer 57

@LizzyLove<3

Answer 58

@LizzyLove<3

Answer 59

@LizzyLove<3

Answer 60

shut up

Answer 61

lol @HawkCrimson

Answer 62

hehe @LizzyLove<3

Answer 63

ur such a dufess :F

Answer 64

@HawkCrimson

Answer 65

@HawkCrimson

Answer 66

and ur anyless? :P:P:P
@LizzyLove<3

Answer 67

@LizzyLove<3

Answer 68

yeah i am... loser:L lol ttyl @HawkCrimson

Answer 69

@HawkCrimson

Answer 70

@HawkCrimson

Answer 71

@HawkCrimson

Answer 72

@LizzyLove<3

Answer 73

@HawkCrimson

Answer 74

@LizzyLove<3