Exercise 8.3.4: Selecting coders for 3 different projects. About (a) A manager must select three coders from her group to write three different software projects. There are 7 junior and 3 senior coders in her group. The first project can be written by any of the coders. The second project must be written by a senior person and the third project must be written by a junior person. How many ways are there for her to assign the three coders to the projects if no person can be assigned to more than one project

168 ways

Step-by-step explanation:

Given

Required

Number of ways 3 project can be assigned

Starting with the second project.

This can be assigned to only senior coders

So:

Then, the third project.

This can be assigned to only junior coders

So:

At this point, we are left with 2 senior coders and 6 junior coders

Since the first can be assigned to anybody.

The number of selection is then calculated as:

what is the starting amount? the question is not clear sorry.

step-by-step explanation:

answer: 1 and 3

step-by-step explanation: