Poleng_InLove
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 ?
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hartnn
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common difference = A2-A1 = A3-A2 = 11
hartnn
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A3-A2 = 11
2n - (n-1) =11
can you find 'n' from here ??
Poleng_InLove
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Hmm ...
hartnn
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was that a yes or no ?? O.o
Poleng_InLove
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Wait .
hartnn
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waiting...
agent0smith
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A2 - A1 = 11
(n - 1) - (n -5) = 11
-1 + 5 = 11
no. 4 does not equal 11.
hartnn
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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'.
Poleng_InLove
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How can I find the n ?
derek123
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why 4 again??
hartnn
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common diff. always remains constant/same!
hartnn
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2n - (n-1) =4
hartnn
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n+1=4
derek123
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n=5??
hartnn
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is 5+1 = 4 ??
Poleng_InLove
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n=3 ?
hartnn
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yes. n=3 :)
agent0smith
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Yep, common difference of 4 works here.
Poleng_InLove
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n-5=-2
n-1=2
2n=6
hartnn
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\(\checkmark \)
derek123
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haha i used this d = A2 - A1 = 4
agent0smith
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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.
Poleng_InLove
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That's okay :))
derek123
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WHAT IF THE COMMON DIFFERENCE IS 9??
hartnn
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from d = A2 - A1
the common diff. must be 4
cannot be anything else.
derek123
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OH WELL. xD
hartnn
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did you ppl start learning sequences ??
derek123
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yup,xD arithmetic seq and series and mean and geom seq and series
derek123
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the formulae actually are mixing in my head. O_o
agent0smith
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\[\large{\color{Blue}{T}\color{Yellow}{U}\color{Magenta}{T}\color{Pink}{O}\color{MidnightBlue}{R} I\color{Blue}{A}\color{Green}{L}!}\]
^^ Is it a tutorial on how to have a seizure? :P
amistre64
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nice "tutorial" :)