##### If $A=\begin{bmatrix}4&7&2&9\end{bmatrix}$and $B=\begin{bmatrix}12\\1\\5\\6 \end{bmatrix}$ then AB=

Difficulty: Easy

##### How many terms are there in the AP, in which $a_{1}=11, a_{n}=68, d=3$

Difficulty: Easy

##### If $A = \{1, 2, 3\}$ and $B = \{4, 5, 6\}$ then find the number of subsets of $A \cup B$ are

Difficulty: Easy

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