Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 Re: Help Me ! » Sequence question » 2013-03-08 15:23:30

Hi,

If you subtract consecutive terms, you see that you get:


Subtracting again, you get

You could find the quadratic.  However, another way is to realize that

, which, after solving, gives

#2 Re: Exercises » Angles » 2013-03-08 15:18:13

1.  A
2.  A
3.  Ri
4.  Re
5.  Re
6.  A
7.  O
8.  O
9. O
10. O
11. S
12. F
13. A
14. Re
15. A
16. O
17. A
18. A
19. A
20. Re

#6 Re: Ganesh's Puzzles » Trigonometry » 2011-11-24 14:29:31

Hey guys!  I haven't been online... here's a couple answers

#10 Re: Ganesh's Puzzles » Trigonometry » 2011-09-18 09:51:08

Any new problems here?  I'm up for some of these, as I need to hone my trig.

#15 Re: Ganesh's Puzzles » 10 second questions » 2011-09-06 14:19:56

Hi,

I'm sorry if I'm posting these a bit late; I recently joined this site. 

#20 Re: Dark Discussions at Cafe Infinity » Biological Immortality. » 2011-09-05 12:17:11

I heard somewhere in the 2050s, but I could be wrong.  Imagine the slogan: "Immortality in a bottle."  That would be something.  However, even if it does become possible, there are certain ethical dilemmas that could be raised.

#22 Re: Introductions » New arrival » 2011-09-04 04:16:31

True, true.  I dropped the E because I couldn't figure out a way to fit it in, but your way works perfectly bob.

#24 Introductions » New arrival » 2011-09-04 03:11:31

Stormtangent
Replies: 8

Hi everyone,

I discovered this forum in a search for interesting logic puzzles and programming exercises; ever since then, I have meandered through each of the quirky sections and found many topics discussed that interest me and many people after my own heart.  I have always loved solving that challenge math problem, writing that tricky program (like a word processor), cracking that seemingly impossible code, and this seems like a great place to talk with people that have similar interests.  It probably is also a good place to start getting into topics that have previously eluded me, such as calculus, and hone my skills in areas that I already know, such as trigonometry. 

By the way, I am going into ninth grade. 

Here's a fairly simple code to crack:

Hydrogen Iodine.  Holmium Tungsten Argon Yttrium Oxygen Uranium?

smile

#25 Re: This is Cool » 2011 is a prime number! » 2011-09-03 15:06:45

2011 is also the sum of three consecutive primes:  661, 673, and 677.

Furthermore, 2011= 39^2 + 17^2 + 7^2.

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