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aacharyauk

OK -im really sorry. Right ummmmm

I used this formula to get the nth term of this series

1,3,6,10,15

here i had to look at the third difference to get a constant and hence the formula became

a + (n-1)d + (1/2)(n-1)(n-2)c1 + 1/6 (n-1)(n-2)(n-3)

and for this series

1, 5, 14, 30, 55

the formula remained as it was as at the second difference i had a constant.

Now i had to prove why this formula works for working out the nth term.

I used this formula to get the nth term of this series

1,3,6,10,15

here i had to look at the third difference to get a constant and hence the formula became

a + (n-1)d + (1/2)(n-1)(n-2)c1 + 1/6 (n-1)(n-2)(n-3)

and for this series

1, 5, 14, 30, 55

the formula remained as it was as at the second difference i had a constant.

Now i had to prove why this formula works for working out the nth term.

are these diagonals of the pascal triangle?

aacharyauk

OK -im really sorry. Right ummmmm

I used this formula to get the nth term of this series

1,3,6,10,15

here i had to look at the third difference to get a constant and hence the formula became

a + (n-1)d + (1/2)(n-1)(n-2)c1 + 1/6 (n-1)(n-2)(n-3)

and for this series

1, 5, 14, 30, 55

the formula remained as it was as at the second difference i had a constant.

Now i had to prove why this formula works for working out the nth term.

I used this formula to get the nth term of this series

1,3,6,10,15

here i had to look at the third difference to get a constant and hence the formula became

a + (n-1)d + (1/2)(n-1)(n-2)c1 + 1/6 (n-1)(n-2)(n-3)

and for this series

1, 5, 14, 30, 55

the formula remained as it was as at the second difference i had a constant.

Now i had to prove why this formula works for working out the nth term.

it should read - a + (n-1)d + (1/2)(n-1)(n-2)c1 + 1/6 (n-1)(n-2)(n-3)c2

u mean the coursework-

its somit bout squares in rectangles

its somit bout squares in rectangles

theone

The series 1,5, 14, 30, 55. has first difference 4, thus change in difference 5 between terms. But 14 + 14 is not equal to 30, am i missing something?

because it goes onto the third difference

the two sequences i gave u are completely separate

they dont link in any way between the two.

aacharyauk

because it goes onto the third difference

the two sequences i gave u are completely separate

they dont link in any way between the two.

the two sequences i gave u are completely separate

they dont link in any way between the two.

u dont need to fo 14+14

the first differences go 4,9,16,25 and the second differences go 5,7,9 and the third difference is constant at 2.

Eeek. I did that investigation and I had to find some degree level maths stuff about limits to prove my formula.

Actually, I don't think this wasn't the one I did. This isn't the fencing one is it?

- The nth term of a sequence is n^2+n
- Arithmetic series- sum of first ten terms is 460
- Question about Un = Sn - S(n-1) formula (Sequences and series)
- Do you think A Level Maths has enough proof in it?
- Proving a term is in a quadratic sequence
- Arithmetic sequence diverge or converge formula?
- Arithmetic or geometric sequence
- How do I use proof by induction on this, specifically using f(k+1)-f(k)?
- Maths - bouncing ball question
- a level maths first principle question
- A-level Edexcel Maths - Proofs
- Help with question
- gcse maths topic
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- Advanced mathematics
- Connection between KEavg and KEtotal
- MAT practice
- Maths A level - Trignometric proof
- Probability Question
- A Level maths proof

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