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A research team has 8 software engineers, 6 analysts, and 4 programmers. A committee of 4 members is to be selected. Find the number of ways to select the committee if: i) all members are software eng
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3 partsStep-by-step solution
8 stepsThe research team has:
- 8 Software engineers
- 6 Analysts
- 4 Programmers Total members = . A committee of 4 members is to be selected.
We use the combination formula .
Part i· 1 step
All Software engineers
This means all 4 members selected must be Software engineers. There are 8 Software engineers available.
Calculate the number of ways to choose 4 Software engineers from 8.
The number of committees consisting of all Software engineers is .
Part ii
At least two are analysts
This means the committee can have 2, 3, or 4 analysts. The remaining members will be chosen from the non-analysts (8 Software engineers + 4 Programmers = 12 non-analysts).
Calculate for 2 analysts.
Choose 2 analysts from 6: .
Choose 2 non-analysts from 12: .
Number of ways = .Calculate for 3 analysts.
Choose 3 analysts from 6: .
Choose 1 non-analyst from 12: .
Number of ways = .Calculate for 4 analysts.
Choose 4 analysts from 6: .
Choose 0 non-analysts from 12: .
Number of ways = .Sum the possibilities.
Total ways = .
The number of committees with at least two analysts is .
Part iii
At most one programmer is among the 4
This means the committee can have 0 or 1 programmer. The remaining members will be chosen from the non-programmers (8 Software engineers + 6 Analysts = 14 non-programmers).
Calculate for 0 programmers.
Choose 0 programmers from 4: .
Choose 4 non-programmers from 14: .
Number of ways = .Calculate for 1 programmer.
Choose 1 programmer from 4: .
Choose 3 non-programmers from 14: .
Number of ways = .Sum the possibilities.
Total ways = .
The number of committees with at most one programmer is .
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