Question

There are N lamps b1, b2, ... bn with its buttons under each lamp.
The button has a strange behaviour, if the button of a lamp bi is pressed once, bi changed from lights on into lights off or from lights off into lights on. In addition, there are some lamps too that follow to change, from lights on into lights off or from lights off into lights on.
Relations between other lamps that also change expressed by the relation (i, j). If the relation (i, j) is exists, then keystrokes on bi will have an impact too on the lamp bj, and vice versa, keystrokes in bj will impact too on the lamp bi.

Answer 1

There are 5 lamps: b1, b2, b3, b4, and b5, and there is a relation (1, 2), (1, 5), (2, 3), (2, 4), (3, 5), ( 4, 5).
If at first all the lights off, what happens with b1 and b2 if a pressure is applied
successively on the buttons b1, b2 and b3, and b5, respectively once?

(A) both of the lamps lights off
(B) both of the lamps lights on
(C) light b1 and b2 lights off
(D) lights off and b2 lights on

Answer 2

@jiteshmeghwal9 This question actually using my national language. So sorry if it has many wrong grammar.

Answer 3

keystroke = pressure

Answer 4

you know squeeze the button

Answer 5

I will write again the question

There are 5 lamps: b1, b2, b3, b4, and b5, and there is a relation (1, 2), (1, 5), (2, 3), (2, 4), (3, 5), ( 4, 5).
If at first all the lights off, what happens with b1 and b2 if a pressure is applied
successively on the buttons b1, b2 and b3, and b5, respectively once?

(A) both lamps lights off
(B) both lamps lights on
(C) b1 lights on and b2 lights off
(D) lights off and b2 lights on

Answer 6

It still same with the question above, I just fix some wrong grammar

Answer 7

Option (A) is the answer ??

Answer 8

B

Answer 9

They just provide image as a keyword

Answer 10

I'll upload it. Maybe it can help you

Answer 11

http://prnt.sc/cjchmm
any ideas?

Answer 12

sorry i was going to ask u about option B because in the end all the lamps will light on

Answer 13

I see...
Pls tell how is it

Answer 14

Initially all the lamps were off.

Pressing b_1=lamps 1,2,5 lights on & lamps 3,4 were off. (1, 2), (1, 5)
Pressing b_2=Lamps 3,5 lights on & lamps 1,2,4 switches off.(2,3)(2,4)
Pressing b_3=Lamp 2 on & lamps 1,3,4,5 switches off.(2,3)(3,5)
Pressing b_5=Lamp 1,2,3,4,5 switches on.(1,5)(3,5)(4,5)

Answer 15

I got it
Thx

Answer 16

yw