Question 81 it's due tomorrow it's very important i need to know it me

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

How do i do this? i don’t understand

Consider the following function. which of the following graphs corresponds to the given function? w. x. y. z. a. z b. y c. x d.