Question

The jailor of xyz had 6 fruits- 3 oranges, 2 apples, and 1 pine apple. four prisoners-101,102,103,104 are lined up one behind the other. the jailor helps them put the fruit on their head so that they cant see the fruit on their head.prisoner nuber 101 can see the fruit kept on heads of 102,103,104. prisoner number 102 can see fruit on 103 and 104 head. 103 can see fruit kept on 104's head. 104 cant see as no one is at the front of the line. now jailor asks prisoners to tell the name of fruit kept on their head. neither of the could reply.
what was the fruit on prisoners number 104's head?
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Answer 1

Orange is on prisoners number 104's head

Step-by-step explanation:

there are total 6 fruits

3 oranges

2 apples

1 pineapple

if 101 see 2 apples and pineapple he will know he has orange on his head

so 101 is seeing atleast one orange

now 102 knows this fact so if he does not see any orange ahead this mean he has orange on his head

this mean he 102 is seeing atleast one orange

now 103 knows above fact hence if he does not see any orange on 104 then 103 will be having orange on his head

this mean 103 sees an orange on 104

hence 104 has orange on his head

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