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Riddles, brain puzzles and mathematical problems - Printable Version

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RE: Riddles, brain puzzles and mathematical problems - BAndrew - 04-02-2014

(04-02-2014, 06:58 PM)Froge Wrote:
(04-02-2014, 05:54 PM)BAndrew Wrote: 4^4 + (4*4)^4 --> allowed

But there are four 4s and five here?

Ooops yeah, sorry. In my hurry to show that you can't use another digit I forgot about that. Thanks. I corrected it.

RE: Riddles, brain puzzles and mathematical problems - Froge - 04-02-2014

Spoiler below!
(2 + 2)! = 24
3^3 - 3 = 24
4*4 + 4 + 4 = 24
((5 - 5) * 5 + 5)! / 5 = 24
6 - 6 + 6 + 6 + 6 + 6 = 24

will update post as i find moar

RE: Riddles, brain puzzles and mathematical problems - BAndrew - 04-02-2014

Alright, good job so far!

Please use spoilers because maybe others want to solve it.

write

(spoiler) your text here (/spoiler)
but instead of ( and ) use [ and ] respectively

RE: Riddles, brain puzzles and mathematical problems - BAndrew - 04-03-2014

New short riddle. Find the next number in the sequence.

2, 3, 3, 5, 10, 13, 39, 43, 172, 177, ?

Explain your reasoning. There might be many possible answers.

RE: Riddles, brain puzzles and mathematical problems - 7heDubz - 04-04-2014

Noctemwolf found this one! (my brother =P)

885.
Because...
Spoiler below!

starting with 2 you add one (2 to 3), then multiply by 1 (3 to 3), then add 2 (3 to 5) then multiply by 2 (5 to 10) so on so forth. reaching 177 you multiply it by 5 and reach 885.



RE: Riddles, brain puzzles and mathematical problems - BAndrew - 04-04-2014

Great thinking Noctemwolf! Tongue

RE: Riddles, brain puzzles and mathematical problems - PutraenusAlivius - 04-04-2014

Based on the short number riddle.

1, 2, 4, 7, 11, 16, 26, 37, 49, 62, 76, 91, ?

Next number?
NOTE: It's just simple addition.

RE: Riddles, brain puzzles and mathematical problems - BAndrew - 04-04-2014

(04-04-2014, 12:40 PM)SomethingRidiculous Wrote: Based on the short number riddle.

1, 2, 4, 7, 11, 16, 26, 37, 49, 62, 76, 91, ?

Next number?
NOTE: It's just simple addition.

Spoiler below!

111
+1+2+3+4+5+10+... continue until you reach 15 and then go to 20 and so on. In other words you skip the numbers that end with 6,7,8 and 9



RE: Riddles, brain puzzles and mathematical problems - PutraenusAlivius - 04-04-2014

(04-04-2014, 01:34 PM)BAndrew Wrote:
(04-04-2014, 12:40 PM)SomethingRidiculous Wrote: Based on the short number riddle.

1, 2, 4, 7, 11, 16, 26, 37, 49, 62, 76, 91, ?

Next number?
NOTE: It's just simple addition.

Spoiler below!

111
+1+2+3+4+5+10+... continue until you reach 15 and then go to 20 and so on. In other words you skip the numbers that end with 6,7,8 and 9


Nice work man!

RE: Riddles, brain puzzles and mathematical problems - BAndrew - 04-04-2014

Let q1,q2,q3,...qn natural numbers.
(Set of natural numbers is N={1,2,3,...})

Given that:
  • q1/q2 = k
  • q1/q2 = q2/q3 = ... = qn-1/qn

Find q1/qn


NOTE: Only basic algebra is required. Nothing special.
NOTE 2: The solution is really, really short, but elegant.