As of April 2006, roughly 50 million web domain names were registered (e. g., ). (a) How many domain names consisting of just two letters in sequence can be formed?

question is incomplete.

step-by-step explanation:

try remembering the steps

step-by-step explanation:

i have done this all on a piece of paper but idk how to put it on here cuz it needs to be drawn

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