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  • The number of ways in which 20 letters <img alt="\mathrm{x_{1}, x_{2}^{2}, \ldots x_{10}, y_{1}, y_{2}, \ldots, y_{10}}" src="https://entrancecorner.oncodecogs.com/gif.latex?%5Cmathrm%7Bx_%7B1%7D%2

The number of ways in which 20 letters \mathrm{x_{1}, x_{2}^{2}, \ldots x_{10}, y_{1}, y_{2}, \ldots, y_{10}} be arranged in a line so that suffixes of the letters \mathrm{x} and also those of \mathrm{y} are respectively in ascending order of magnitude is

Option: 1

126


Option: 2

64


Option: 3

2^{20}


Option: 4

184756


Answers (1)

best_answer

Choose 10 places (out of 20) for \mathrm{x_{1}, x_{2}, \ldots, x_{10}} in \mathrm{{ }^{20} C_{10}} ways.

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Riya

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