1.

The number of ways in which 20 letters a_(11),a_(2),a_(3),.............,a_(10),b_(1),b_(2),b_(3),.........,b_(10)be arranged in a line so that suffixes of the letters 'a' and also those of 'b' are respectively in ascending orders of magnitude is………

Answer»

`(20!)/(10!)`
`(20!)/((10!)^(2))`
`2^(20)`
`20!-10!.10!`

SOLUTION :`underset(0)overset(pi//4)(INT)tanxdx-[(1)/(2)XX(1)/(2).1]`


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