How many permutations of the letters in the word MISSISSIPPI are palindromes? How many of permutation of letters in  the word "$\bf{MISSISSIPPI}$" are palindromes?
$\text{My Try}:$ Palindrome is a word which read as  same forwards and backwards.
Here word "$\bf{MISSISSIPPI}$" contain $\bf{4I\;,4S\;,2P}$ and $\bf{1M}$. So total $11$ letters.
So must be in the form of $-----M-----$,
so we put $\bf{2I\;,2S\;,1P}$ on left of $M$,
which can be done as $\displaystyle =\frac{5!}{2!\times 2!\times 1} = 30$.
But I did not understand how can we not permute $\bf{2I\;,2S\;,1P}$ on right of $M$?

Once you put the letters to the left of $M$ then the letters to the right are fixed. They are the letters to the left in the reverse order
