Infinite Sequences Flashcards - GRE Subject Test: Math

Step 1: Define what an infinite sequence is...

An infinite sequence is a sequence that is non-terminating.

Step 2: Determine if each sequence above is infinite...

For $(n!)^{(n!)}, n\ge 0$ , the sequence is always infinite because the set of factorials is infinite. Also, the set of values by raising two factorial powers together is also infinite, it never has an ending term.

For $-1\le x \le 5, x\in \mathbb{Z}$ , this sequence is FINITE!

For $\sqrt[n]{x}; x \in \mathbb{R},n \in \mathbb{N}$ , this sequence is FINITE!

Infinite Sequences - GRE Subject Test: Math

Which of the following are not infinite sequences?

$$I. (n!)^{(n!)}, n\ge 0$

$$II. 1\le x\le5; \forall x \in \mathbb{Z}$

$$III. \sqrt[n]{x}; x \in \mathbb{R},n \in \mathbb{N}$