Question

need help with level D and E!!! http://www.insidemathematics.org/assets/problems-of-the-month/growing%20staircases.pdf

Answer 1

what's wrong with answer on previous question?

Answer 2

i need the basic whole formula,so I can solve the questions on level D and E

Answer 3

And you don't think formula is \(\dfrac{n^2(n+1)}{2}\)?

Answer 4

you were already given formula in previous question by other user. use this formula for level D and E.

Answer 5

what stopping you from doing that?

Answer 6

that doesn't work

Answer 7

that was for level A and B

Answer 8

That's \(\dfrac{n(n+1)}{2}\)

Formula for D and E is same as A and B but multiplied by \(n\).

Answer 9

oh, but he told me n(n+1)/2

Answer 10

thanks