Consider a given itemset $\{$I$1,$ I$2,$ I$4\}.$ The table below indicates whether its subsets are frequent $(1$ means a subset is frequent, $0$ means it is not$).$

Subset Frequent?

$\{$I$1\}1$

$\{$I$2\}1$

$\{$I$4\}1$

$\{$I$1,$ I$2\}1$

$\{$I$1,$ I$4\}0$

$\{$I$2,$ I$4\}0$

Is the given itemset $\{$I$1,$ I$2,$ I$4\}$ frequent? Enter $1$ if it is frequent, $0$ it is not, and $-1$ if maybe $($that is$,-1$ would indicate that it may be frequent or not$).$

I$1$ is frequent $(1),$ I$2$ is frequent $(1),$ I$4$ is frequent $(1),$ I$1$ and I$2$ is frequent $(1),$ I$1,$ and I$4$ is not frequent $(0),$ I$2$ and I$4$ is not frequent $(0).$ Since not all subsets of I$1,$ I$2,$ and I$4$ are frequent, specifically $\{$I$1,$ I$4\}$ and $\{$I$2,$ I$4\},$ we cannot definitively determine if $\{$I$1,$ I$2,$ I$4\}$ is frequent or not. It may or may not be frequent.