Answer:
the answer is 0.2252
Explanation:
There are 5+7+8 = 20 crayons in total.
⇒
P
=
C
(
15
,
4
)
(
5
20
)
4
(
15
20
)
11
=
(
15
!
)
5
4
15
11
(
11
!
)
(
4
!
)
20
15
=
0.2252
Explanation :
Because we replace, the odds for drawing a blue crayon are
each time 5/20. We express that we draw 4 times a blue one
and then 11 times not a blue one by (5/20)^4 (15/20)^11.
Of course the blue ones do not have to be drawn first so there
are C(15,4) ways of drawing them, so we multiply by C(15,4).
and C(15,4)
=
15
!
11
!
4
!
(combinations)
Step-by-step explanation:
HOPE IT HELPS!!シ︎☺
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