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Two tungsten lamps with resistances R(1)...

Two tungsten lamps with resistances `R_(1) and R_(2)`, respectively , are connected first in parallel and then in series in a lighting circuit of negligible internal resistance. Given `R_(1) gt R_(2)`.
(a) Which lamp will glow more brightly when they are connected in parallel ?
(b) If the lamps of resistance `R_(1)` now burns out, how will the net illumination produced change ?
(c ) Which lamp will glow more brightly when they are connected in series ?
(d) If the lamp of resistance `R_(2)` now burns out and lamp `R_(1)` alone is plugged in , will the net illumination increase or decrease ?

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