1
Q
P(event)=
A
required/total outcomes
2
Q
if a coin is tossed, P(H)=
A
1/2
3
Q
if a coin is tossed, P(T)=
A
1/2
4
Q
if a die is thrown , P(1)=
A
1/6
5
Q
if a die is thrown, P(5)=
A
1/6
6
Q
total probability is always equal to
A
1
7
Q
probability always lies between
A
0 and 1
8
Q
P(x)=0, x is
A
impossible
9
Q
P(x)=1, x will
A
certainly occur
10
Q
at least minimum
A
11
Q
at least maximum
A
12
Q
and/ both means
A
multiply
13
Q
or/either means
A
add
14
Q
A
15
Q
A
16
Q
A
17
Q
sample space
A
P(x)= curly bracket ,,_ curly bracket
18
Q
tree diagram
A
the total of each branch is always 1
don’t forget to label
19
Q
A
intersection
20
Q
U
A
union
21
Q
intersection means
A
multipy
22
Q
union means
A
+ and - with the intersection
23
Q
possibility space diagram is used for
A
2 fair die
24
Q
use factorial when
A
number of outcomes are random
25
P(ABC)=
3!
26
P(AAB)=
3!/2!
27
P(AA BBB)=
5!/2!*3!
28
P(AAA)
3!/3!
29
use combination for
random and without replacement events
30
31
mutually exclusive events
2 events cannot take place simultaneously
32
mutually exclusive events conditions
33
independent events
if either events A and B can occur without being affected by the other, then the 2 events are said to be independent
34
independent events conditions
35
P(A, given B) or
P(AIB)
36
P(AIB)=
37
conditional probability type
38
if 2 events are independent
they cannot be mutually exclusive and vice versa
39
straight
multiply
40
one particular boy
so keep him fixed
41
9709
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