Coin 1 H T
or T H
Coin 2 H T
or
T H 4
Combining
H T
T H
H T
T H
From this table the result can be
2 x H
2 x T
H T
or
T H
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Two coins tossed sample space is (H=Heads, T = Tails) as follows. HH, HT, TH, TT is the sample space.
Sample space for two coins tossed is: HH HT TH TT Therefore at most one head is HT TH TT or 3/4 or 0.75.
Assuming the variable of interest is the face on top: H (= heads) or T (= tails), then they are the four possible outcomes: HH, HT, TH and TT.
8
You find the sample space by enumerating all of the possible outcomes. The sample space for three coins is [TTT, TTH, THT, THH, HTT, HTH, HHT, HHH].
The sample space for tossing 2 coins is (H = Heads & T = Tails): HH, HT, TH, TT