MultipleChoice, Multiple Answers on the GRE Math Test — Practice Questions
Although math questions typically have only one right answer, this isn’t always the case. As a result, some multiplechoice questions on the GRE Math test will give you a list of answers and ask you to choose more than one.
The following practice questions ask you to find different possible values in a sequence and the different perimeters for a triangle, given two sides.
Practice questions

In the given sequence a_{1}, a_{2}, a_{3}, a_{4}, a_{5}, …, a_{n}, where a_{1} = 2, n is a positive integer, and a_{n}_{+1} = 3a_{n} + 2, which of the following could be a value of a_{n}?
Select all that apply.
A. 2
B. 6
C. 8
D. 10
E. 26
F. 28

The lengths of two sides of a triangle are 5 and 7. Which of the following could be the perimeter of the triangle?
Select all that apply.
A. 14
B. 17
C. 19
D. 22
E. 24
F. 27
Answers and explanations

A, C, E
Use the formula to find a_{2} by substituting a_{1} for a_{n} and a_{2} for a_{n}_{ + 1}. Now the formula becomes a_{2} = 3a_{1} + 2. Because a_{1} = 2, a_{2} = 3(2) + 2, or 8. Do this again with the next few values of a, up to and through 28, because that’s the highest number; a_{3} has a value of 26, which makes a_{4} have a much greater value than anything in the list.

B, C, D
With two sides equaling 5 and 7, the third side has to be between 2 and 12, not inclusive. This places the perimeter between 14 and 24, again not inclusive. Only three of the numbers fall within that range.