Four wires meet at a junction. In two of the wires currents I1 = 1.51 A and I2 = 2.99 A enter the junction. In one of the wires current I3 = 6.71 A leaves the junction. Find the current in the fourth wire and indicate its direction.
Current: _______ A
Direction:
a) out of the junction
b) into the junction
c) undetermined