大神门走过路过不要错过，来帮渣渣看一道数学题呀~

To furnish a room in amodel home, an interior decorator is to select 2 chairs and 2 tables from acollection of chairs and tables in a warehouse that are all different from eachother. If there are 5 chairs in thewarehouse and if 150 different combinations are possible, how many tables arein the warehouse？

A.6

B.8

C.10

D.15

E.30

(PS:一碰到概率题就蒙了，请教大神们概率题的做题技巧）