Xentius

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387 reputation

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20 Questions

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7	Combinatorial proof to $n! = (n-1)[(n-1)! + (n-2)!]$
7	A question related to Pigeonhole Principle
6	Binomial formula for $(x+1)^{1/3}$ (related to Newton's binomial theorem)
6	Shortest solution to order 26 alphabet letters, no two vowels occurring consecutively
5	Combinatorial explanation to following recurrence relation $a_n = 2 a_{n-1} + a_{n-2}$

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387 Reputation

+25	Combinatorial explanation to following recurrence relation $a_n = 2 a_{n-1} + a_{n-2}$
+35	Combinatorial proof to $n! = (n-1)[(n-1)! + (n-2)!]$
+5	primitive pythagorean triple, $\gcd(b,c)=1$ proof
+5	Binomial formula for $(x+1)^{1/3}$ (related to Newton's binomial theorem)

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14 Tags

0 combinatorics × 9	0 sequences-and-series × 2
0 discrete-mathematics × 7	0 analysis
0 homework × 3	0 binomial-coefficients
0 metric-spaces × 3	0 calculus
0 modular-arithmetic × 2	0 number-theory

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$Mathematics Stack Exchange$	Mathematics	387 rep	6
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	Super User	101 rep	1

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