Question

Okay, so I was surfing and saw this picture with the following question:

How big is the chance to answer this question correct?
a. 25%
b. 50%
c. 75%
d. 25%

It's my summer vacation and my brain is currently in the off position.. Any of you able to figure this out?

Answer 1

25 %

4 options to pick so..

Answer 2

yeah but two of those options have the same answer.. that changes things, it has to...

Answer 3

lol yeah didnt notice that 2/4 = 1/2 = 50 %

nice question :)

Answer 4

scratch that
this looks involved

Answer 5

It's kind of a headbanger... It feels like I'm trying to do math while I'm drunk...

Answer 6

(1/2)*(1/2) + (1/4)(1/4)*2

Answer 7

assuming all answers are equally likely

Answer 8

explain yourself...

Answer 9

P(25% being answer) = 1/3
if it is an answer then P(picking it) = 2/4 = 1/2

P(25% overall) = (1/3)*(1/2)

Answer 10

P(50% or 75 % being answer) = 1/3 + 1/3 = 2/3
P(50% or 75 % being picked) = 2/4

P(50% or 75% overall) = (2/3)*(2/4)

Answer 11

giving up... :'(

Answer 12

Why? I thing you got the answer...

Answer 13

no clue how to combine these :\

P(25% overall) = (1/3)*(1/2)
P(50% or 75% overall) = (2/3)*(2/4)

my head hurts...

Answer 14

I think it doesn't matter what you do with those two... Since it would never lead to any of the answers above... thought, it seems correct to me...

Answer 15

sorry i didnt get you. you mean answer should be one of the listed ?

Answer 16

ok google has something related... checking :)

Answer 17

yeah the answer should be one of the listed.... the questions was asked exactly as stated above.. I don't know anything else either.. Which is why it's bugging me XD

Answer 18

check this

http://math.stackexchange.com/questions/76491/multiple-choice-question-about-the-probability-of-a-random-answer-to-itself-bein#comment181095_76491

Answer 19

How big is the chance to answer this question correct?
a. 25%
b. 50%
c. 75%
d. 25%

-- if i say 25% is the correct answer, then probability is 50 % (since two of them are there). so its not correct.
-- if i say 50% is the correct answer, then probability is 25%. so its not correct
-- if i say 75% is the correct answer, then probability is 25%. so its not correct

not that i understand it completely.... but it makes some sense now :) question cannot be answered