# Try to guess the number of cubes in the following arrangements (Fig 15.17).

i) There are 4 columns and 2 rows in the first line.
So, the total  number of cubes in the first line is

And there is total 3 such line.
Therefore, the total number of cubes are

ii) There are 3 columns and 1 row in the first line at the bottom.
So, the total number of cubes in the first line are

And there are total 2 such lines
So, the total number of cubes at the bottom are
Now, we can see that two cubes are placed on the second line
Therefore, the total number of cubes are

iii)   There are 3 columns and 1 row in the first line at the bottom.
So, the total number of cubes in the first line are

And there are total 2 such lines
So, the total number of cubes at the bottom are
Now, we can see that two cubes are placed on the second line  and one cube in the front of the first line
Therefore, the total number of cubes are

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