Asked by Teacher

I think the answer is wrong online so I would like to know what the correct answer is before I teach a student!

If it takes 6 cubes to build 3 steps, how many cubes will be needed for 11 steps?

It sounds so easy but my answer doesn't match the answer sheet. Thanks!
Answered by drwls
For N steps, the number needed is
1 + 2 + ... + N
This sum can always be written
N (N+1)/2

N = 11, the number of blocks needed is
11x12/2 = 66
Answered by Teacher
Thank you so much!
Answered by Ryan
Bruh u is not a teacher
Answered by mr. pixie stick
right I have seen her/his post and they all are just questions looking for answers
Answered by mr. pixie stick
Btw I am not a teacher my self I just like pixie sticks
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