MBA
Exam
Find the number of ways in which we can arrange 2n letters X 1, X 2,.......X n and Y 1, Y 2,.........Y nin a line so that the suffixes of the letters ‘x’ and those of the letters ‘y’ are respectively in ascending order of magnitude. 1) 1 2) n 3) <sup>
n
</sup>
C
<sub>
1
</sub>
+
<sup>
n
</sup>
C
<sub>
2
</sub>
+
<sup>
n
</sup>
C
<sub>
3
</sub>
+.....+
<sup>
n
</sup>
C
<sub>
n
</sub> 4) 2
<sup>
n
</sup>
[135.......(2n-1)/n!
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