AP EAMCET202018 Sep 2020Morning ShiftMathematicsPermutation and CombinationActual
In an apartment there are 30 kids. If each kid plays table tennis with other kid, then the total number of matches played by them
Options
- A( ³⁰ C ₂ )
- B( ³⁰ P₂ )
- C( ³⁰ C ₂-1 )
- D( ³⁰ P₂-1 )
Correct answer
A. ( ³⁰ C ₂ )
Step-by-step solution
The number of required matches played is same as the number ways to choose two kids among 30 kids and it is equal to ( ³⁰ C₂ ).