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visits member for 2 years, 2 months
seen Dec 3 at 3:35

Jul
2
awarded  Curious
May
7
awarded  Notable Question
Apr
23
accepted How do I begin proving this binomial coefficient identity: ${n\choose 0} - {n\choose 1} + {n\choose 2} - {n\choose 3} + \dots = 0$
Apr
22
comment How do I begin proving this binomial coefficient identity: ${n\choose 0} - {n\choose 1} + {n\choose 2} - {n\choose 3} + \dots = 0$
That was the answer at the back of the book. But I don't get what just that statement means. Is that a proof to just "say" that?
Apr
22
asked How do I begin proving this binomial coefficient identity: ${n\choose 0} - {n\choose 1} + {n\choose 2} - {n\choose 3} + \dots = 0$
Mar
14
awarded  Notable Question
Feb
25
awarded  Popular Question
Dec
1
awarded  Popular Question
Sep
27
awarded  Yearling
Jul
29
awarded  Popular Question
Jun
13
accepted Probability of adjacent seating
Jun
13
asked Probability of adjacent seating
May
15
accepted Basic independent probability question
May
15
comment Basic independent probability question
Okay, according to the definition there (and Google), so it is times, which means it's $^$. Thanks.
May
15
comment Basic independent probability question
Hmm...the probability the purse won't hold them all is the probability that all three coins come up heads (as you mentioned). But what is that, in math? Okay well it can't be $1/2 + 1/2 + 1/2$ because that probability would be $> 1$. So is it really $1/2 * 1/2 * 1/2$? Isn't there something about adding independent events and multiplying dependent events? Or are these events dependent? Or have I got it hopelessly wrong?
May
15
revised Basic independent probability question
added 167 characters in body
May
15
asked Basic independent probability question
Apr
26
comment Does one always use augmented matrices to solve systems of linear equations?
Wow, great additions, thanks.
Apr
26
revised Are these two permutation matrices equivalent?
deleted 71 characters in body
Apr
26
comment Are these two permutation matrices equivalent?
Thanks. 8 more chars to go