anonymous
  • anonymous
There are three terms in Arithmetic Sequence . The common difference is 11 . A1=n-5 , A2=n-1 , and A3=2n . What are the terms ?
Mathematics
schrodinger
  • schrodinger
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hartnn
  • hartnn
common difference = A2-A1 = A3-A2 = 11
hartnn
  • hartnn
A3-A2 = 11 2n - (n-1) =11 can you find 'n' from here ??
anonymous
  • anonymous
Hmm ...

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hartnn
  • hartnn
was that a yes or no ?? O.o
anonymous
  • anonymous
Wait .
hartnn
  • hartnn
waiting...
agent0smith
  • agent0smith
A2 - A1 = 11 (n - 1) - (n -5) = 11 -1 + 5 = 11 no. 4 does not equal 11.
hartnn
  • hartnn
ok...i guess, 11 as common difference(d) should naot have been given. in that case d = A2 - A1 = 4 then A3-A2 = 4 and find 'n'.
anonymous
  • anonymous
How can I find the n ?
anonymous
  • anonymous
why 4 again??
hartnn
  • hartnn
common diff. always remains constant/same!
hartnn
  • hartnn
2n - (n-1) =4
hartnn
  • hartnn
n+1=4
anonymous
  • anonymous
n=5??
hartnn
  • hartnn
is 5+1 = 4 ??
anonymous
  • anonymous
n=3 ?
hartnn
  • hartnn
yes. n=3 :)
agent0smith
  • agent0smith
Yep, common difference of 4 works here.
anonymous
  • anonymous
n-5=-2 n-1=2 2n=6
hartnn
  • hartnn
\(\checkmark \)
anonymous
  • anonymous
haha i used this d = A2 - A1 = 4
agent0smith
  • agent0smith
Note that we can't guarantee these are the correct answers, since... the question claims the difference is 11. Either that's wrong, or you didn't write out the question correctly.
anonymous
  • anonymous
That's okay :))
anonymous
  • anonymous
WHAT IF THE COMMON DIFFERENCE IS 9??
hartnn
  • hartnn
from d = A2 - A1 the common diff. must be 4 cannot be anything else.
anonymous
  • anonymous
OH WELL. xD
hartnn
  • hartnn
did you ppl start learning sequences ??
anonymous
  • anonymous
yup,xD arithmetic seq and series and mean and geom seq and series
anonymous
  • anonymous
the formulae actually are mixing in my head. O_o
hartnn
  • hartnn
then going through this might be helpful....http://openstudy.com/users/hartnn#/updates/503bb2a0e4b007f9003103b0
agent0smith
  • agent0smith
\[\large{\color{Blue}{T}\color{Yellow}{U}\color{Magenta}{T}\color{Pink}{O}\color{MidnightBlue}{R} I\color{Blue}{A}\color{Green}{L}!}\] ^^ Is it a tutorial on how to have a seizure? :P
amistre64
  • amistre64
nice "tutorial" :)

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