Question

28 matches were played in a volleyball tournament each team playing one against each of others ,how many teams were there?

Answer 1

Answer:

since each team played one against each other .

Let total teams were X.

X(X-1)/2 = 28

x² -x = 56

x²-x -56 = 0

x²-8x+7x - 56 = 0

x(x-8)+7(x-8) = 0

(x-8)(x+7) = 0

X = 8 (Ans.)

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