There are two electric bulbs of 40 W and 100 W . Which one will be brighter when first connected in series and then in parallel,

There are two electric bulbs of 40 W and 100 W . Which one will be brighter when first connected in series and then in parallel,
A. 40 W in series and 100 W in parallel
B. 100 W in series and 40 W in parallel
C. 40 W both in series and parallel will be uniform
D. 100 W both in series and parallel will be uniform

There are two electric bulbs of 40 W and 100 W . Which one will be brighter when first connected in series and then in parallel,

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