Doubt in the formula of X

#1

while calculating X we considered the second case as HT but we didn’t consider the case where it’s TT, why is that so?

#2

We had H at first place na?

#3

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#4

yes, but why do we have H in the first position? Why not T, you can get x consecutive Heads in x+2 trials in two ways:

  1. HT HHHH…
  2. TT HHHH…

while calculating our ans we only considered the first case and not the second one, why

#5

whats the probability for getting H at first time ? Its 1/2. Right!
we have considered it.
I think you are getting confused with probability. Please watch the video again.