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

Question

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, ${ }^{30} \mathrm{C}_2$, ${ }^{30} P_2$, ${ }^{30} \mathrm{C}_2-1$, ${ }^{30} P_2-1$

MARKS App · Accepted Answer

The number of required matches played is same as the number ways to choose two kids among 30 kids and it is equal to ${ }^{30} C_2$.

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