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Byju's Answer
Standard XII
Mathematics
Permutation: n Different Things Taken All at a Time When All Are Not Different.
8.A bag conta...
Question
8.A bag contains 15 balls of which 6 are identical find the number of ways of selecting 8 balls.
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Q.
Assertion :A bag contains 10 balls in which 3 are identical, then number of ways of selecting 6 balls from the bag is
8
C
2
+
8
C
4
Reason: If a lot has n things out of which p are identical then number of ways of selecting r things from the lot is
r
∑
r
=
r
−
p
n
−
p
C
r
if
r
>
p
.
Q.
A bag contains
23
balls in which
7
are identical. Then find the number of ways of selecting
12
balls from bag.
Q.
A boy runs to a shopping mall and comes back in 15 minutes. his speed on the way to the mall is 5 metre per second and his speed on the way back is 4 metre per second. find the distance to the mall.
Q.
A bag contains 8 mangoes, 6 pineapples and X oranges. If the probability of selecting a pineapple is 1/3 then find the number of oranges in the bag
Q.
The number of ways in which
5
balls can be selected from a bag containing
5
identical and
5
different balls is
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Permutation: n Different Things Taken All at a Time When All Are Not Different.
Standard XII Mathematics
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