A department has 16 employees (8 men and 8 women). You must form a project team with exactly 3 men and 3 women. How many distinct teams are possible (order does not matter)?

Difficulty: Easy

Correct Answer: 3136

Explanation:


Introduction / Context:
This is a direct combinations problem: select a fixed count from each of two disjoint groups (men and women) where order is irrelevant and no role distinctions exist within a chosen team.



Given Data / Assumptions:

  • Men = 8, Women = 8.
  • Select exactly 3 men and exactly 3 women.
  • Teams are sets; internal order does not matter.


Concept / Approach:
Use combinations independently on each group and multiply: total ways = C(8,3) * C(8,3). This is the fundamental rule of counting for independent choices across disjoint sets.



Step-by-Step Solution:
C(8,3) = 8*7*6 / (3*2*1) = 56.Total teams = 56 * 56 = 3136.



Verification / Alternative check:
Symmetry implies selecting either gender first yields the same multiplication. No ordering or role labels are present, so there is no extra factorial factor.



Why Other Options Are Wrong:
112 and 720 come from misusing permutations or partial counts; 112896 multiplies by spurious orderings.



Common Pitfalls:
Accidentally using permutations (which would imply ordered roles) or adding instead of multiplying across independent gender selections.



Final Answer:
3136

More Questions from Permutation and Combination

Discussion & Comments

No comments yet. Be the first to comment!
Join Discussion