Made Easy

Question

here they’ve ask 

bulb can be ‘ON’ irrespective of the condition of other switch

then it should be ‘OR’ gate

because 0 + 0 =0

             0 + 1 =1

             1 + 0 = 0

             1 + 1 =1

but their answer is X-OR gate ??? how can it be possible

 

Comments

@MINIPanda
oh yeah you are right .... so we cant use OR gate
but how can Xor gate??? in Xor if second bulb is on 1 xor 1 =0 so how can this possible with Xor

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Did you check my previous comment..I mentioned there that by staying near one switch, we can switch on or off the bulb. Say we are using XOR b/w two switches.

If my switch is off(0), and the bulb is on(1) means the other switch must be on(1) because 0 xor 1=1. If I want to turn off the bulb, then I can press my switch, then 1 xor 1 =0 means bulb is now off. If I want to keep the bulb glowing, then keep the switch off.

Similarly if the other switch is off(0), then I can manipulate in the same way to make the bulb glow or not glow.

press my switch to turn on. 1 xor 0 =1

don't press my switch to keep it off. 0 xor 0=0

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ohk i got it now Thank you