1.

The number of ways in which 20 letters a1,a2,a3,…,a10,b1,b2,b3,…,b10 can be arranged in a line so that suffixes of the letters a and also those of b are respectively in ascending order of magnitude is

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The number of ways in which 20 letters a1,a2,a3,,a10,b1,b2,b3,,b10 can be arranged in a line so that suffixes of the letters a and also those of b are respectively in ascending order of magnitude is



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