Question

The set {$x:x$ is a letter in the word 'SELECT'} in roster form is

• A. $\left(S,E,L,C,T\right\}$
• B. $\left(S,E,L\right\}$
• C. $\left(S,E,L,C\right\}$

Answer 1

The correct option is A $\left(S,E,L,C,T\right\}$

The letters in the word 'SELECT' are S, E, L, C and T, where E comes twice.
Note that if one or many elements of a set is/are repeated, the set still remains the same.
Thus, {S,E,L,E,C,T}={S,E,L,C,T} is the required set.