If one basket contains 25 oranges, then n such baskets will contain
oranges.
[a]
25 + n
[b]
25n
25
[C]
Idl
25 - n
Answers
5n=60
Step-by-step Explanation
Step-by-step explanation:
basket contains
15
apples and
10
oranges out of which
4
apples and
2
oranges are defective. If a person takes two fruits at random, what is the probability that either both are apples or both are good
A.
221
300
B.
312
401
C. None of these D.
1
2
Answer: Option A
Explanation:
Number of ways in which two fruits can be taken from
25
fruits
=
25
C
2
(∵ total fruits
=
15
+
10
=
25
)
Number of ways in which two apples can be taken from
15
apples
=
15
C
2
P(both are apples)
=
15
C
2
25
C
2
Number of ways in which two fruits taken can be taken from
19
good fruits
=
19
C
2
(∵ total good fruits
=
(
15
+
10
)
-
(
4
+
2
)
=
19
)
P(both are good)
=
19
C
2
25
C
2
There are
11
good apples. Number of ways in which two apples can be taken from these
11
good apples
=
11
C
2
P(both are apples and both are good)
=
11
C
2
25
C
2
P(both are apples or both are good)
= P(both are apples )+ P(both are good) - P(both are apples and both are good)(Reference: addition rule)
15
C
2
25
C
2
+
19
C
2
25
C
2
−
11
C
2
25
C
2
=
15
×
14
2
×
1
+
19
×
18
2
×
1
−
11
×
10
2
×
1
25
×
24
2
×
1
=
221
300