self Maths Puzzle

There were 20 red balls and 20 blue and 20 green balls what percent of probability of selecting 6 balls out of which we have 2 balls of the same color.

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self Other Question

Mr. Yellow, Mr. Brown and Mr. Green. They were wearing Tie of Yellow, Brown and Green Color. Mr. Brown said, We all r wearing Ties of color which do not match with our name. One person says Yes u r absolutely right. who was in green tie? Can U say which person wear the tie of which color? 8 eggs were identical except one is lighter. How many times we have to weight to find out to find out the lighter.( ans 3..).But explain steps for hw to cme answer