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19 Oct 2013, 06:46
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
85% (00:47) correct
15%
(01:07)
wrong
based on 264
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In a kickball competition of 9 teams, how many possible matches can each team play with each other?
(A) 9
(B) 16
(C) 24
(D) 36
(E) 54
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Did you try this? How about +KUDOS for me?
(A) 9
(B) 16
(C) 24
(D) 36
(E) 54
------------
Did you try this? How about +KUDOS for me?
19 Oct 2013, 07:00
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amgelcer
Hi amgelcer.
Each team can play with each other in 9C2 ways
9C2 = 9*8 / 1*2 = 36
Option D
Hope it helped
Cheers
Qoofi
19 Oct 2013, 08:58
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Qoofi
Qoofi is correct. In case you need a general reminder of the combination formula as well, here it is:
nCr, read "n choose r" is n!/r!(n-r)!
Here, then we have 9 teams chosen 2 at a time. So 9C2 is 9!/2!(9-2)! --> 9!/2!7! --> 9*8/2.
That may help on future combination problems. Cheers!
