p-3 please help me with the below problem with step by step explanation clearly.

For the sketched circuit, each lightbulb has equal resistance. Answer the following questions, with a VERY BRIEF justification: a) Which is brighter, RI or Rs? b ) Which is brighter, RI or R? R 3 Which is brighter, R. or R.? R3 is now removed and that leg of the circuit left open. d) What happens to the brightness of Re as compared with before R3 was removed? e) What happens to the brightness of Re as compared with before R3 was removed? What happens to the brightness of Ri as compared with before Ra was removed