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Jun
5
comment Finding two sides of a triangle
Hint: apply the definition of sine and cosine (geometrically, what do they mean?)
Jun
4
comment Elementary doubt on ratios
Looks good to me. Btw, there is no difference between the two answers you gave.
Jun
4
accepted Odds of winning at minesweeper with perfect play
Jun
3
comment A probability question about a dog
What do you mean?
Jun
3
answered A probability question about a dog
Jun
3
comment A probability question about a dog
Sounds like HW...
Jun
2
comment Evaluate $ \binom{n}{0}+\binom{n}{2}+\binom{n}{4}+\cdots+\binom{n}{2k}+\cdots$
Ok, so they are both exactly half the of the row (they get every element once as opposed to twice). Since the sum of a row is 2^n, this gives 2^(n-1) as the answer.
Jun
2
comment count the number of subsets
Got it, thanks.
Jun
2
accepted count the number of subsets
Jun
2
answered Evaluate $ \binom{n}{0}+\binom{n}{2}+\binom{n}{4}+\cdots+\binom{n}{2k}+\cdots$
Jun
2
comment Expanded concept of elementary function?
There are functions that are defined by sums and products, in addition to those defined by integrals.
Jun
2
comment count the number of subsets
And the elements of A are sub-sub-sets and so are not counted?
Jun
2
comment count the number of subsets
Why isn't every element also a subset?
Jun
2
comment count the number of subsets
@ShreevatsaR I don recall if there were letter there or numbers, but I assume that that also would not matter. Why is my answer wrong?
Jun
2
comment count the number of subsets
That was the way the question was phrased. What would make more sense?
Jun
2
asked count the number of subsets
Jun
1
comment Odds of winning at minesweeper with perfect play
@Joshua perfect play can mean making guesses. Thats the point of the question. What are the odds that you will win (not 1, as some guessing may be required)?
Jun
1
comment Odds of winning at minesweeper with perfect play
@Chris Eagle Agreed, I guess I was hasty. So the conclusion is that its basically impossible to figure out?
Jun
1
comment Odds of winning at minesweeper with perfect play
Thanks the kind of thing i was looking for.
Jun
1
comment Odds of winning at minesweeper with perfect play
So how many of those configurations can there be, and what are the odds of getting out of them is the question