List all the ways to select two members from s with repetition. the order in which the members are selected is not important. for example, dd is allowed and ba is the same vselection as ab.
s=[e, f,g, h,j]

15 ways

Step-by-step explanation:

We are given that  a set S={E,F,G,H,J}

We have to find the number of ways to select two members from S with repetition.

Combination formula

We have n=5 , r= 2

Number of ways in which two members  from S can be selected when repetition is not allowed=

Number of ways in which two members  from S can be selected when repetition is not allowed=

Number of ways in which two members  from S can be selected when repetition is not allowed=

When a member repeat then combination

{E,E},{F,F},{G,G},{H,H},{J,J}

There are 5 combination when a member is repeat and select two members from S.

Total number of ways in which to select two members from S with repetition =10+5=15 ways