SOLUTION: I need an expression for the following ordered pairs:
(1,1), (2,3). (3,6), (4,10), (5,15), ...
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Question 389128: I need an expression for the following ordered pairs:
(1,1), (2,3). (3,6), (4,10), (5,15), ...
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
f(x) = xC2 = x(x+1)/2
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