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Bulbs and switches Puzzle
3 bulbs in the 3rd floor and switches in the 1st floor. You are in in the 1st floor. You have to know which switch belongs 2 which bulb.its not in order.u can go up once an u can switch on once. how will you do it?

Read Solution (Total 1)

Switch on one of the switch and wait for 10 mins. then swich off the and switch on the second one. Now you go to that room, hotter bulb belongs to first switch and glowing bulb belongs to current switch which is on and third one is for other bulb
12 years agoHelpfull: Yes(3) No(2)

Infosys Other Question

Four people, say, A, B, C, D belonging to M, N, O, P group, not in order decided for a picnic. All of them brought salad from their home in their traditional style. Fruits used in salad were Grapes, Banana, Apple, Cherry. All of them used exactly 3 fruits in their salad. None of them used same combination of fruits in their salad. Some clues given are :
A doesn’t belong to group M used Apple.

B who doesn’t belong to group M and O used Apple & Cherry.

Person belonging to M group used Apple & Cherry in his salad.

C and person belonging to O used Cherry & Grapes both, but person belonging to N used only one of them.

Question goes on like this and finally you need to answer 4 questions based on these clues :

(a) Which of the following fruits is not used by M group ?

Apple, Banana, Grapes, Cherry

(b) Which combination was used by B ?
60-60=60 what can you derive from it?