1.Let a be the average of all odd prune number less than 50.

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1.Let a be the average of all odd prune number less than 50.The integer,most close to a is( ).
2.Color the following diagram so that any two neighboring fields are different colors.How many colors do you need the least?
翻译!

设A是小于50的质数的平均数,最接近A的整数是（）.
给下列图标涂色,使得相邻区域颜色不同.最少需要多少种颜色?

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