 |
|
|
 |
New Member
|
|
Apr 6, 2015, 03:25 AM
|
|
Help with maths sequence
Hi.
What's the following numbers in the sequence
1-4-14-51-216-
Many thanks.
Michelle.
|
|
 |
BossMan
|
|
Apr 6, 2015, 03:37 AM
|
|
What do YOU think ?
While we're happy to HELP we wont do all the work for you.
Show us what you have done and where you are having problems..
|
|
 |
New Member
|
|
Apr 6, 2015, 05:19 AM
|
|
Hi,OK - I've tried looking at the differences in the numbers so, between 1 and 4 there is a difference of 3, between 14 and for a difference of 10, 51 and 14 a difference of 37 and between 216 a difference of 165. I've then looked at the 2nd differences and the third differences and finally I end up with 81, so none of the differences are the same!I know that because of the big difference in numbers I will need to multiply. I've tried adding first and then multiplying and it works for the first two:eg. 1 x 3 +1 = 4 4 x 3 + 2 = 1414 x 3 + 3 = 47!! HELP!! Michelle
|
|
 |
Expert
|
|
Apr 6, 2015, 05:51 AM
|
|
Hint: play around with the idea that nth term is (n-1) times the (n-1)th term, plus a factor.
|
|
 |
New Member
|
|
Apr 6, 2015, 08:19 AM
|
|
Hi,This is doing my brain in! I've tried that on the second and third numbers and it works but not on the others.((4-1) x 5) - 1 = 14((14-1) x 4) - 1 = 51 Michelle
|
|
 |
Expert
|
|
Apr 6, 2015, 08:40 AM
|
|
For n-2: 2nd number is equal to the first number times 1, plus ...what?
For n=3: 3rd number is equal to the 2nd times 2, plus what?
For n=4: the 4th number = 3rd number times 3, plus?
etc.
|
|
 |
New Member
|
|
Apr 6, 2015, 08:47 AM
|
|
 Originally Posted by ebaines
For n-2: 2nd number is equal to the first number times 1, plus ...what?
For n=3: 3rd number is equal to the 2nd times 2, plus what?
For n=4: the 4th number = 3rd number times 3, plus?
etc.
OK - gottit. Thx.
|
|
Question Tools |
Search this Question |
|
|
Add your answer here.
Check out some similar questions!
Help in maths
[ 1 Answers ]
Please help me! I need help in the following exercises..
1)f(x)=x^2+ax+b+root(4-x^2)
a)find the domain of f.
b)if f pass through A(-2,-2) and B(2,2)
I)find a,b
ii)if a=1 and b=-4 find the point that f intersects y'y.
2)g(x)=x^2+ax+b/x-1
if g intersects the y'y at the point A(0,3) and pass...
Maths
[ 3 Answers ]
We are doing some sponsored challenges. We are sponsored for each correct answer. All money goes to children's charity work. We're at a loss with the maths! I'm doing a home tuition course, but I still don't understand a lot of areas.
It doesn't matter how many are in a group or who helps you. We...
View more questions
Search
|