Submit a question to our community and get an answer from real people.

What is the explicit function for 4,12,24,40,60

Report as

4, 12, 24, 40, 60
4 + 8 = 12
12 + 12 = 24
24 + 16 = 40
40 + 20 = 60
For each term n, take the term before
it, add 4n.

Helpful (1) Fun (1) Thanks for voting Comments (0)
Report as
Add a comment...

do u mean a pattern?

Helpful (1) Fun Thanks for voting Comments (12)
Report as
what is the rule for this sequence?:)
Report as
look at 1,3,6,10,15
u get the term by adding 1,2,3,4 & so on to the previous term.
the sequene u gave is obtained by multiplying each term of the above sequence by 4.
And this was a good one.if u get anymore puzzles like this pls share.. i luv em
Report as
comment em here.... :)
Report as
If you do it your way you'd get
Report as
4, 16, 48, 192, 768.
Report as
how? i told 2 multiply each term of 1,3,6,10,15... by 4 getting 4,12,24,40,60...
Report as
i knew people would get ur pattern also ; since muliplication is distributive.
Report as
You're right too. I can't believe I didn't see that.
Report as
That's great thank you!! But, What would the equation be if I wanted to plug in the 127th term?
Report as
ok here it is
for simpleness consider 1,3,6,10,..
let tn be the nth term.
So in YOUR sequence, tn=4*(tn of my sequence 1,3,6,..)
Thus 127th term = 2*127*128/2
Report as
Report as
thanks! :D
Report as
Add a comment...

a sub n= a sub (n-1) + 4n

Helpful Fun Thanks for voting Comments (0)
Report as
Add a comment...
Do you have an answer?
Answer this question...
Did you mean?
Login or Join the Community to answer