Electronic circuit consists of 5 ON-OFF switches (on or off switch). How many possible combinations are there if:
switches are in any position,
we know that the third switch must always be on,
we know that three series switches are always on and the other two are in any position,
we know that two series switches are not in the same positions,
we know that at least three switches are off,
we know that the second and fourth switches are in the ON position.
