You are required to choose two topics from a list of five to write about on your science test. How many different pairings are p
ossible?
2 answers:
There are many 20 different pairings possible.
A B C D E represent the subjects
A+A1
A+B2
A+C3
A+D4
A+E5
B+B6
B+C7
B+D8
B+E9
C+C10
C+D11
C+E12
D+D13
D+E14
E+E15
15 combos
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I am not sure about the last two phrases, but here's what I think.
2(n+18)
18(2+n)
98/7=14
14*17=238
238 is your answer
