Current location - Training Enrollment Network - Mathematics courses - A rather difficult math problem
A rather difficult math problem
1 There are five ways to place the chess pieces.

There are four ways to put chess pieces in the second row.

There are three ways to put chess pieces in the third row.

There are two ways to put chess pieces in the fourth row.

There are 1 ways to put chess pieces on the fifth line.

According to the principle of multiplication, the number of species obtained by amplification method is 5*4*3*2* 1= 120.