Posted by Anonymous on Saturday, September 15, 2012 at 10:29am.
A playground is being designed where children can interact with their friends in certain combinations.
If there is 1 child, there can be 0 interactions.
If there are 2 children, there can be only 1 interaction.
If there are 3 children, there can be 4 interactions.
If there are 4 children, there can be 9 interactions.
How many interactions will there be for 8 children?

math  Reiny, Saturday, September 15, 2012 at 12:01pm
Are they implying that interaction (I) between children (c) is a quadratic function ????
then
I(c)= (c1)^2
so I(8) = 7^2 = 49
(look like a textbook editor's feeble attempt to "make mathematics real" )

math  Franicsco paulino, Wednesday, December 12, 2012 at 9:42pm
A playground is being designed where children can interact with their friends in certain combinations.
If there is 1 child, there can be 0 interactions.
If there are 2 children, there can be 6 interactions.
If there are 3 children, there can be 15 interactions.
If there are 4 children, there can be 27 interactions.
How many interactions will there be for 7 children?
60
81
105
108

math  Nicole, Monday, January 14, 2013 at 5:13pm
105
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