in a box there 34 batteries. 6 of the batteries do not work. If 4 are selected without replacement find the probability that all of them work.

Ineed the problem dude

Which of the following is an example of an opposing signal? no examplthates given.   i would say, that traffic lights in a city at major intersections direct the flow of traffic in opposite directions so would be an example.also, stop signs on either side of the same street would be an example. at a train crossing, the light for allowing car traffic in opposite directions or not would be another example.