Question

Mr. X decorated his house with fairy lights on a celebration. He bought 40 bulbs and operated at 220V. He found all the bulbs are glowing with different brightness. He called his friend Mr. Y. He rearranged and made the bulbs glow equally. a)What was the problem with Mr. X's set up? Give reason. b)How did Mr. Y arrange the bulbs

please answer I will mark you as brainlist​