Question

You have two red and two blue blocks. How many different towers can you build that are four blocks high using these blocks?

• A. 6

Answer 1

The correct option is A 6
We know that, systematic listing helps in listing of all possible outcomes for an event in an organised/systematic way.

Assume red colour block is represented by 'R' and blue colour block is represented by 'B'. The following are all the possibilities of making different towers using these four blocks:
(i) R-R-B-B
(ii) R-B-R-B
(iii) R-B-B-R
(iv) B-B-R-R
(v) B-R-B-R
(vi) B-R-R-B

$\therefore$ there are six possibilities of making different towers using these four blocks.