Posted by **Jennifer** on Sunday, December 8, 2013 at 5:44pm.

in a store all the oranges are stacked in triangular pyramids, each layer of oranges is in the shape of an equilateral triangle and the top layer is an single orange. How many oranges are are in a stack ten layers high

- math -
**Steve**, Monday, December 9, 2013 at 12:10am
the layers are triangular numbers:

1,3,6,10, ... n(n+1)/2

The pyramid is pyramidal numbers:

1=1

1+3=4

1+3+6=10

...

1+3+...+n(n+1)/2 = n(n+1)(n+2)/6

Now just plug in n=10

## Answer this Question

## Related Questions

- Math - The question is: A Woman is selling an (X) amount of Oranges The first ...
- Math - Part 1- Mr. Santiago bought 10 crates of oranges. There were 50 oranges ...
- maths - PLS HELP!!!! Some children were sharing oranges. If each child took 3 ...
- Math - Mr.Santiago brought 10 crates of oranges. There were 50 oranges in each ...
- Maths - Some children were sharing oranges. If each child took 3 oranges, there ...
- math - the 1st branch produced 1 orange. the 2nd branch produced 2 oranges, the ...
- Math (for PsyDag) - This is the example i was given: The oranges in a box have a...
- math - Mr. Davis wants to buy some oranges. He visits a local grocery store and ...
- math - a box contain 60 oranges.3/5 of the oranges were equally shared among 4 ...
- Math - Oranges are on sale at $0.99 per pound. Either bought 3.25 pounds of ...

More Related Questions