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Dec
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comment What is the relationship between the some of the first n natural numbers and the number of unique pairs in n+1
I don't understand this. I really tried. How does the number of pairwise segments connect to the sum of the numbers. Sorry for being dense.
Dec
6
asked What is the relationship between the some of the first n natural numbers and the number of unique pairs in n+1
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awarded  Curious
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Nov
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accepted How many topological orderings exist for this graph?
Oct
18
comment How many topological orderings exist for this graph?
I posted the three edges of the graph. x--->y if there is an edge from x to y
Oct
18
asked How many topological orderings exist for this graph?
Oct
15
accepted Binomial formula when the probability is 1/2
Oct
15
comment Binomial formula when the probability is 1/2
ahh i see. Thanks!
Oct
13
accepted How is the formula for partition of a set derived.
Oct
13
asked How is the formula for partition of a set derived.
Oct
13
comment Binomial formula when the probability is 1/2
Can you elaborate? I don't understand this still. I do understand how the sum of all n choose k equals 2^n. That just ends up being the set of all subsets which has 2^n elements. What I don't understand is what the 1/2 probability has to do with deriving that formula.