You are given a set of 5 discs, numbered 2, 3, 5, 6, and 9.

How many four-digit numbers can be represented by placing four discs side by side without repeating any?

24

60

120

You are given a set of 5 discs, numbered 2, 3, 5, 6, and 9.

How many five-digit numbers can be represented by placing five discs side by side without repeating any?

24

60

120

Step-by-step explanation:

I am guessing that is the answer ‍♀️

360 different combinations

solution:

→c= a b , that is product of a and b is possible only when when a is m × n matrix and b is n × p matrix.

that is, number of columns of a= number of rows of b.

so, size of matrix , c= a b is , if a = (m × n)matrix

b= (n × p)matrix

then a b = [ (m × n)matrix] ×[   (n × p)matrix ]

→→c= a b= [m × p ] matrix

→→size of product a b will be equal to = number of rows of a × number of columns of b