Question

! a school has 25 classrooms and an office. an inercom system connects the classrooms to each other and to the office. what is the total number of classroom to classroom and classroom to office connections?

what i need is an explanation

Answer 1

650 connections

Explanation:

Each classroom has 25 connections including the office, therefore 26classrooms(including the office) are connected to 25 places: 26*25=650 connections