UPSC Prelims 2013·CSAT·Quantitative Aptitude·Combinatorics and Probability

A tennis coach is trying to put together a team of four players for the forthcoming tournament. For this 7 players are available: males A, Band C; and females W, X, Y and Z. All players have equal capability and at least 2 males will be there in the team. For a team of four, all players must be able to play with each other. But, B cannot play with W, C cannot play with Z and W cannot play with Y. If all the three males' are selected, then how many combinations of four member teams are possible?

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Last updated 23 May 2026, 3:31 pm IST
  1. A1
  2. B2Correct
  3. C3
  4. D4

Explanation

Here's a brief explanation: 1. **Fixed Members:** The question states that all three males (A, B, C) are selected. 2. **Remaining Slot:** Since the team needs four players, and three males are already selected, one more player must be chosen. This player must be a female from the available W, X, Y, Z. 3. **Applying Restrictions for the Female Player:** * "B cannot play with W": Since B is in the team, W cannot be selected. * "C cannot play with Z": Since C is in the team, Z cannot be selected. * "W cannot play with Y": This restriction is not relevant here because W has already been ruled out, so Y can be chosen independently. 4. **Valid Female Choices:** * W is out. * Z is out. * X has no restrictions with A, B, or C, so X is a valid choice. * Y has no restrictions with A, B, or C, so Y is a valid choice. 5. **Possible Teams:** * Team 1: A, B, C, X * Team 2: A, B, C, Y Therefore, there are 2 possible combinations of four-member teams. The final answer is B.
Quantitative Aptitude: A tennis coach is trying to put together a team of four players for the forthcoming tournament. For this 7 players are a

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