An algebra problem by Rahil Sehgal
Algebra
Level
pending
Let 𝑆 be a set of real numbers with mean 𝑀. If the means of the sets 𝑆 ∪ {15} and 𝑆 ∪ {15,1} are 𝑀 + 2 and 𝑀 + 1, respectively, then how many elements does 𝑆 have?
2
4
3
5
6
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