a total of 35 students are going to a field trip to NASA'S Johnson space center in houston,texas if there needs to be one adult
2 answers:
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Answer:
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