TERMS AND PHRASES FROM PROBABILITY
(top row of table below)
To find "sizes", you may need COUNTING PRACTICE

Experiment Sample Space
S
Size of Sample Space
n(S)
Event in English Event as a Set
E
Size of Event
n(E)
Probability of Event
Single Coin flip S1 = { H,T } 2 One head appears E1 = { H } 1
P(E1) = n(E1)

n(S1)
= 1
2
Double Coin flip
S2 = HH,
HT,
TH,
TT 
4 At least one head appears
E2 = HH,
HT,
TH 
3
P(E2) = n(E2)

n(S2)
= 3
4
Triple Coin flip
S3 = HHH,
HHT,
HTH,
HTT,
THH,
THT,
TTH,
TTT
8 At LEAST two heads appear
E3 = HHH,
HHT,
HTH,
THH 
4
P(E3) = n(E3)

n(S3)
= 4
8
At MOST two heads appear
F3 = HHT,
HTH,
HTT,
THH,
THT,
TTH,
TTT 
7
P(F3) = n(F3)

n(S3)
= 7
8
The coins do not all show the same face
G3 = HHT,
HTH,
HTT,
THH,
THT,
TTH 
6
P(G3) = n(G3)

n(S3)
= 6
8