其它
Timi has $8$ paintings: $3$ of them are drawing landscape, and $5$ of them are drawing figure. Among the $5$ figure paintings, there are $3$ drawing the whole family of Timi, and the other $2$ are drawing himself. Now, Timi wants to put those painting in a line. The $3$ landscape paintings cannot be adjacent. How many ways can he do this? 
Overseas Competition->Knowledge Point->Counting Modules->Permutations and Combinations
$\_2P\_2\times \_3P\_3 \times \_2P\_2 \times \_3P\_3=144$ 