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common difference = A2-A1 = A3-A2 = 11

A3-A2 = 11
2n - (n-1) =11
can you find 'n' from here ??

Hmm ...

was that a yes or no ?? O.o

Wait .

waiting...

A2 - A1 = 11
(n - 1) - (n -5) = 11
-1 + 5 = 11
no. 4 does not equal 11.

How can I find the n ?

why 4 again??

common diff. always remains constant/same!

2n - (n-1) =4

n+1=4

n=5??

is 5+1 = 4 ??

n=3 ?

yes. n=3 :)

Yep, common difference of 4 works here.

n-5=-2
n-1=2
2n=6

\(\checkmark \)

haha i used this d = A2 - A1 = 4

That's okay :))

WHAT IF THE COMMON DIFFERENCE IS 9??

from d = A2 - A1
the common diff. must be 4
cannot be anything else.

OH WELL. xD

did you ppl start learning sequences ??

yup,xD arithmetic seq and series and mean and geom seq and series

the formulae actually are mixing in my head. O_o

nice "tutorial" :)