Exercise 3 (Using Numbers)

It has to do with arithmetic progressions.

This exercise follows numerical order (1,2,3,...)

3+(1)=4

4+(2)=6

6+(3)=?

The answer is "c".

Exercise 4 (With Numbers-Two Variables)

This exercise can be analyzed in two ways:

First, the even numbers are in the increasing order interspersed with the odd ones, in the increasing order too.

Second Analysis:

2(+3)=5

5(-1)=4

4(+3)=7

7(-1)=?

The sequence adds 3 and subtracts 1 (+3-1)

We conclude the answer is "a".

Exercise 5 (With Tokens of Dominoes)

Observe the left half of each domino and then its right half.

Both, the left and the right halves of the domino increase in number

(0-1-2-3 / 1-2-3-4)

and each domino begins with the same number of dots as the former one's second half.

Thus, the answer is letter "c".

Now, exercises using letters.

Razonamiento - Abstract Reasoning