He has has ten patterns of chairs and eight patterns of tables
Hence, A chair can be arranged in 10 ways and
A table can be arranged in 5 ways
Hence one chair and one table can be arranged in 10 x 5 ways = 50 ways
An design manager has 10patterns of chairs & 5patterns of tables. In how many ways can he make a pair of table & chair?

(1) 20
(2) 40
(3) 50
(4) 90
(5) 100