Logical Riddle: How Many Attempts To Make The Flashlight Work?
Use your logical skills to solve this riddle.
You are camping at night and are about to go out for a walk.
You have a flashlight with no batteries in it.
You realize you are carrying 8 batteries out of which only 4 are charged batteries and the other 4 are uncharged.
The flashlight needs 2 charged batteries to work.
You do not know which batteries are charged and which ones are not.
What is the least number of attempts to make the flashlight work?
(An attempt consists of putting two batteries in the flashlight and checking if the flashlight works or not.)
So were you able to solve the riddle? Leave your answers in the comment section below.
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Answer: You will need a maximum of 7 attempts to find 2 working batteries.
Explanation:
Break the batteries into 3 groups: two groups of 3 and one group of 2.
By doing this you guarantee that at least one of the groups has 2 working batteries.
Both of the groups of 3 have 3 possible combinations of 2 batteries and the group of 2 only has 1 combination.
So, 3 + 3 + 1 = 7 tries at most to find two working batteries.