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exactly $4$ letters between $P$ and $S$, is

My TRY:: If we fixed $P$ and $S$, Then there are $10$ letters $\bf{ERMUTATIONS}$

out of $10$, we have to select $4$ letters of $4$ gap b/w $P$ and $S$ and then arrange in this Gap.

Is I am Thinking Right or Not.

If Not plz explain me ,Thanks