Write the following sets in roster form :

$\mathrm{F} =$ The set of all letters in the word $\mathrm{BETTER}$

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$F =$ The set of all letters in the word $BETTER$

There are $6$ letters in the word $BETTER,$ out of which letters $E$ and $T$ are repeated.

Therefore, this set can be written in roster form as

$F=\{B, E, T, R\}$

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