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 10 ways
Hence one chair and one table can be arranged in 10 x 10 ways = 100 ways
An design manager has 10patterns of chairs & 10patterns of tables. In how many ways can he make a pair of table & chair?
[1] 20
[2] 40
[3] 80
[4] 90
[5] 100