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624 = 2[sup]4[/sup] + 2[sup]5[/sup] + 2[sup]6[/sup] + 2[sup]9[/sup]
How many countries can you name?
It's quite difficult to get over 60 in this one.
The site is good for other things too --
Powers of 2 game (up to 2^32)
Powers of n^10 (useful to see your mental potential)
Primes
Common Polyatomic Anions Chemical Names
"Name That Mathematician"
Cubic Numbers
There are more pretty fun ones, though I find the science section quizzes more interesting.
http://www.sporcle.com/games/elements.php
Useful game to memorise the periodic table. Whether you're memorising them by group, period, or possibly even backwards, that game'll help you.
Unfortunately, I can't find any game that lets you memorise anything else to do with the periodic table - i.e. compound names, or electron shell capacities. Though, I guess you could just do that on paper.
It looks like it can easily be solved by normal means. We are given;
ab = 1
bc = 2
cd = 3
de = 4
ea = 6
Multiply the five equations together;
a²b²c²d²e² = 144
=> abcde = 12
=> cde = 12
=> e = 4
Then just substitute back into ea, and then the rest. That looks like the simplest way to do it - I don't see why one would choose any other method, especially with matrices.
The LHS of the equation reduces to y after noting that the divergence of a curl is zero, and
the
is cancelled by the integral in the denominator using the above form and a change of variables.The right hand side presumably falls to a similar sort of identity application; I would guess the last two terms are zero and the first two fractions probably almost entirely cancel. Anywho, I'll let the interested figure the rest of it out. This will take a fair bit of time to do.
Hello -- registered at your site, and testing for bugs.
It's a nice idea... I wish you the greatest success. I'll submit a few problems, and see how it goes.
Is it.
INTJ
Introverted - 33
Intuitive - 75
Thinking - 50
Judging - 22
You are:
* moderately expressed introvert
* distinctively expressed intuitive personality
* moderately expressed thinking personality
* slightly expressed judging personality
/wrists
I'm at a steady 250-ish... haven't found the time to memorise anymore. At one point I wanted to go for the world record, but it seems a little pointless now, as I'd have to spend several years of my life doing it - which I would prefer not to do.
Good thing to have in your back pocket, though. I've found that it has helped me memorise other things, such as essays - you can hone your technique with pi.
Ganesh, what was your method for calculating the day of the week for any given date?
1955. What day of the week was Fifteenth September, 1969 AD?