Math problem A row of colored light bulbs is hung at the entrance of the National Day store, arranged according to "two reds, four blues and three yellows". What color is the 42nd light bulb? No. 10
Two reds, four blues and three yellows are arranged, that is, two reds, four blues and three yellows are followed by two reds, four blues and three yellows, and so on, and seven are a group. Divide 42 by 7 to get 6, which is exactly 6 groups. The last group is yellow, which means the 42nd group is yellow. And 10 1 is divided by 7 to get 143, that is to say, the 14 group has three more, and the third one is blue, that is to say, 10 1 is blue.