PATTERNS, FUR1 2007 VCAA 6 MC

In the first three layers of a stack of soup cans there are 20 cans in the first layer, 19 cans in the second layer and 18 cans in the third layer.

This pattern of stacking cans in layers continues.

The maximum number of cans that can be stacked in this way is

A. `190`

B. `210`

C. `220`

D. `380`

E. `590`

Show Answers Only

`B`

Show Worked Solution

`20, 19, 18, …, 2,1`

`text(AP where)\ \ \ a=20, l=1 and n=20`

`rArr B`