In a football league each team plays with every of the other teams twice. If the number of teams is 5 then what will be the total number of matches?

A    10 

B    20 

C    9 

D    19 

Solution

Correct Answer: Option B

    একটি করে ম্যাচ খেললে  \(^5{C_{2\;}} = \frac{{5!}}{{2! \times \left( {5 - 2} \right)!}} = 10\)  

 এখন যেহেতু দুটি করে ম্যাচ খেলাবে তাই উওরঃ  10\( \times \) 2 = 20  

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