Let $A = \left\{1,2,4,6,9,10\right\}$,   $B = \left\{1,6,8\right\}$,   $C = \left\{2,3,4,5,6,7,9\right\}$ .
Simplify the following expressions into single sets. Separate elements by commas.

$A \cap B =$

$A \cup B =$

$\left(B \cup C\right) \cap A =$

Note: Sets must be typed using braces (e.g. the set (1,2,3), enter as: {1,2,3}). To represent the empty set, enter: {} .