Questions
The number of ways in which 20 letters ; be arranged in a line so that suffixes of the letters x and also those of y are respectively in ascending order of magnitude is
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a
126
b
64
c
220
d
184756
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Correct option is D
Choose 10 places (out of 20) for x1,x2,…,x10 in 20C10 ways.Similar Questions
is equal to
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