# Chapter 11 - Infinite Series - 11.1 Sequences - Preliminary Questions - Page 537: 1

Substituting $n = 4$ in the equation for $a_{n}$ gives: $a_{4} = 4^{2}-4 = 12$

#### Work Step by Step

For this problem, simply plug in n = 4 into the equation given, $a_n = n^2 -n$

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