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Tardigrade
Question
Mathematics
Number of ways in which the letters A A B B C C can be arranged is also equal to
Q. Number of ways in which the letters A A B B C C can be arranged is also equal to
473
109
Permutations and Combinations
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A
the number of ways in which 4 girls and 4 boys can sit around in circular table if the boys and girls are alternate and a particular boy and a girl are never together in any arrangement.
B
the number of ways in which 6 different toys can be distrubuted equally between Amar, Akbar and Anthony
C
number of ways in which 2 different marbles can be distributed in 10 children if each child gets atmost one marble.
D
the number of ways in which 4 beads can be selected from 6 different beads and put into a circular ring, distinguishing between clockwise and anticlockwise arrangement
Solution:
Actual answer is equal to
2
!
2
!
2
!
6
!
=
90
(A)
72
;
(B)
2
!
2
!
2
!
3
!
6
!
3
!
;
(C)
10
C
2
⋅
2
!
=
90
;
(D)
6
C
4
⋅
3
!
=
90