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More ways to get Braingle...

For The Love of Calculators!

Probability puzzles require you to weigh all the possibilities and pick the most likely outcome.

 

Puzzle ID:#45221
Fun:*** (2.64)
Difficulty:** (2)
Category:Probability
Submitted By:Fhqwhgads*us****

 

 

 



Little Billy has a calculator with 15 buttons. He has 10 keys for 0-9, a key for addition, multiplication, division, and subtraction. Finally, he has an = sign. However, Mark the Meanie messed up the programming on Billy's calculator. Now, whenever Billy presses any of the number keys, it comes up with a random single-digit number. The same goes for the four operations keys (+,-,x, /). So whenever Billy tries to press the + button, the calculator chooses randomly between addition, multiplication, subtraction, and division. The only key left untouched was the = sign.

Now, if Billy were to press one number key, one operation key, then another number key, then the = button, what are the chances the answer comes out to 6?





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Comments

doodinthemood*gb*
Sep 04, 2009

Quite a nice little puzzle, but anyone trained to think in the standard school maths puzzle solving way won't have many problems with it.
dalfamnestAnz*
Sep 04, 2009

I enjoyed it - quite simple with some basic probability understanding, but a good story to make it fun.
Nicky101Aus*
Sep 05, 2009

Fun teaser! I forgot to switch around 6*1 and 6/1 completely slipped my mind .
MatttoyAus*
Sep 08, 2009

I read the thing wrong i guess cuz I completely blanked. Then again I've only been up an hour and I'm tired!
Stack1607A*
Oct 18, 2009

Great puzzle! But I didn't notice 6/1..
javaguru*us*
Dec 30, 2009

Nice clever puzzle. Very easy, but that's OK. Although I prefer the clever and diabolically difficult puzzles, clever easy puzzles are not that common.
BriangleJJ
Jul 08, 2010

Agreed... Messed up a little with the 6x1 and 1x6. Now does he have a ^2 function in his calculator??
eighsseAus*
Jul 27, 2013

Fun and took a little thinking



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