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Byju's Answer
Standard XII
Mathematics
Event
in throwing a...
Question
in throwing a die , what is the probability of getting- a) a multiple of 3 b) a no. less than 6
c) a no. divisible by 5 d) a no b/w 3 and 6.
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Solution
Let
S
be
the
sample
space
.
S
=
1
,
2
,
3
,
4
,
5
,
6
.
n
S
=
6
a
.
Let
E
be
the
event
of
getting
a
multiple
of
3
Now
,
E
=
3
,
6
n
E
=
3
P
E
=
n
E
n
S
=
2
6
=
1
3
b
.
Let
F
be
the
event
of
getting
a
number
less
than
6
.
Now
,
F
=
1
,
2
,
3
,
4
,
5
n
F
=
5
Now
,
P
F
=
n
F
n
S
=
5
6
c
.
Let
G
be
the
event
of
getting
a
number
divisible
by
5
.
Now
,
G
=
5
n
G
=
1
Now
,
P
G
=
n
G
n
S
=
1
6
d
.
Let
H
be
the
event
of
getting
a
number
between
3
and
6
.
H
=
4
,
5
n
H
=
2
P
H
=
n
H
n
S
=
2
6
=
1
3
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Similar questions
Q.
A die is throw once. Find the probability of getting
(1)an even number
(2)a number less than 5
(3)a number greater than 2
(4)a number between 3 and 6
(5)a number other than 3
(6)the number 5
Q.
In a single throw of die, find the probability of getting
(i) a number divisible by 2 or 3
(ii) a number divisible by 2 and 3
(iii) a number between 2 and 5
(iv) a number less than 7
(v) a number not prime.
Q.
What is the probability of getting a no. which is multiple of both
5
&
7
between
2
and
100
?
Q.
What is the probability of getting a number less than 5 in a single throw of a die?
Q.
According to the question an unbiased dice is thrown and the probability of getting an even no. And a multiple of 3 is 1/6... But zero is also a even and a multiple of 3 (proof: 2-2 is 0 and 3*0 is 0 respectively)... So answer should be 2/6 ie. 1/3... Please clear my doubt. 😃
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