Consider an experiment of tossing a coin repeatedly until the outcomes of two consecutive tosses are the same. If the probability of a random toss resulting in a head is $\frac{1}{3}$,then the probability that the experiment stops with heads is:

  • A
    $\frac{1}{3}$
  • B
    $\frac{5}{21}$
  • C
    $\frac{4}{21}$
  • D
    $\frac{2}{7}$

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