If two incandescent bulbs, 50 W and 100 W, are connected in series across the mains, then (compared with their original brightness):
1) Both bulbs will be brighter
2) Both bulbs will be dimmer
3) The 50 W bulb will be brighter and the 100 W bulb will be dimmer
4) The 50 W bulb will be dimmer and the 100 W bulb will be brighter