How many poles will be in a pile of telephone poles if there are 30 in the bottom layer, 29 in the second, and so on, until there is one in the top layer?
1 Answer
Jul 19, 2018
Explanation:
Given: a triangle full of telephone poles with 30 at the bottom, with each consecutive row decreasing by 1 until you have 1 pole at the top.
The answer to this question can be done simply by adding
This problem can also be done by summations :
Using a TI-84:
2nd STAT right arrow MATH 5 .
2nd STAT right arrow OPS 5 .
Then type in the equation (use
A 4th way is to know that