Observe the figure:

The triangle of cream in color at the bottom of the mosaic are .

Similarly in last but one row, the triangle of cream in color at the bottom of the mosaic are .

The triangle are decreasing from to .

Hence the sequence is .

The inverted triangle of blue in color at the bottom of the mosaic are .

Similarly in last but one row, the inverted triangle of blue in color at the bottom of the mosaic are .

The triangle are decreasing from to .

Hence the sequence is .

Therefore, .

Find the sum of sequence .

The first term is .

There are row in all, hence .

The sum of the first terms of an arithmetic sequence .

\

\

\

Therefore, there are blue colored triangles in Mosaic.

.

\

Therefore, there are cream colored triangle in Mosaic.

\

There are cream colored triangle in Mosaic.

There are blue colored triangle in Mosaic.