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Probability = Favourable Obs
                         No . Of Obs
1. for head 
Favourable Obs = 2 [der is a chance of getting head both the times]
Total No.Of Obs = 4

P(of getting head) = 2/4
                                = 1/2

P(of not getting head) = 1 - 2/4
                                      =(4 - 2)/4
                                      = 2/4
                                      = 1/2

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