NEED ASAP PLZ. I DONT NEED THE WORK JUST THE ANSWERS PLZ

Aparallel system functions whenever at least one of its components works. consider a parallel system of n components, and suppose each component works independently with probability 0.5. find the conditional probability that component n works given that the system is working

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

Assemble the proof by dragging tiles to the statements and reasons column