Math Is Fun Forum

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

You are not logged in.

#1630 Re: Puzzles and Games » Add 13 more and post it forever. » 2016-01-06 20:44:17

28938

2(-8 + 9) + 3 + 8 = 2(1) + 11 = 2 + 11 = 13

#1632 Re: Puzzles and Games » Add 13 more and post it forever. » 2016-01-06 19:31:09

28912

2 x 8 -  9 : (1 + 2) = 16 - 9 : 3 = 16 - 3 = 13

#1636 Re: Puzzles and Games » Add 13 more and post it forever. » 2016-01-06 15:25:13

28860

28 - (8 + 6) - cos 0 = 28 - 14 - 1 = 13

#1639 Re: Help Me ! » [ASK] De Morgan's Law for 3 Statements » 2016-01-06 02:55:43

Well, this morning I tried to explain that to her. Thankfully she understood my explanation.

#1640 Help Me ! » [ASK] De Morgan's Law for 3 Statements » 2016-01-05 11:27:15

Monox D. I-Fly
Replies: 2

Weeks ago I had a job to edit a mathematic encyclopedia. When I needed to prove something, I did it using steps similar to ~(p ^ q ^ r) ≡ ~p ∨ ~q ∨ ~r. However, when my co-worker which is also a mathematic education graduate just like me doubted me because as far as she knew, De Morgan's law taught at school and college only consisted of two statements yet I applied it to three statements. I have explained that De Morgan's law still applied for three sentences because the two logical operations within the brackets are the same, but she still didn't believe it. Then I went easy on here by replacing that step with another method and showed that after a few steps I still got the same result as before, but she got confused. According to you guys, is De Morgan's law really only applicable to two statements?

#1641 Re: Exercises » What is 0^0 » 2015-12-31 01:14:20

But... 0 ^ 0 = 0 ^ (1 - 1) = (0 ^ 1) / (0 ^ 1) = 0/0

#1644 Re: Jai Ganesh's Puzzles » Series and Progressions » 2015-12-19 23:43:37

ganesh wrote:

Hi Monox D. I-Fly and bobbym,

The solution SP #160 : 5 and 34 respectively.

Good work, Monox D. I-Fly and bobbym (50% and 100% respectively)!

Uh... Why do I always skip the other question? I just didn't read through.

#1645 Re: Jokes » Einstein's formula » 2015-12-19 23:29:14

How did you know that? It doesn't seem to be a popular riddle.

#1650 Re: Dark Discussions at Cafe Infinity » Purpose of life???? » 2015-12-15 02:47:18

My purpose of life is to take revenge to people who made my teenage life suffer.

Board footer

Powered by FluxBB