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There are 3 red socks, 4 green socks and 3 blue socks. You choose 2 socks. The probability that they are of the same colour is

  1. 1/5
  2. 7/30
  3. 1/4
  4. 4/15                                                                                                                                                                                           ans: total = 10 sockes  , 3C2+4C2+3C2= 12  and    out of 10 = 10C2=45 ,so probability = 12/45= 4/15
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