Latest SELF Aptitude Question SOLUTION: In how many ways can 11 identical books on English and 9 identical books on Maths be placed in a row on a shelf so that two books on Maths may not be together?

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(#M40032692) SELF Numerical Ability question NUMERICAL Keep an EYE

In how many ways can 11 identical books on English and 9 identical books on Maths be placed in a row on a shelf so that two books on Maths may not be together?

Dinesh thatti (10 years ago)

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KUMAR ASHUTOSH  (10 years ago)

first simply place the 9 maths books on shelf.
So, ways to place 9 identical books of maths=9/9=1

now remaining space where 11 identical books on English be placed=10 spaces

now,ways to place 1st English books in 10 positions=10
ways to place 2nd English books in 10 positions=10
.
.
. therefore, total ways to place 11 English book=[10^11]/11

total ways=[10^11]/11

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