Question by Lê Quốc Trần Anh - Discuss with MathYouLike

Lê Quốc Trần Anh Coordinator

16/03/2018 at 11:25

What is the units digit of \(2^{2017}\cdot7^{2017}\)?

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Dao Trong Luan Coordinator 16/03/2018 at 11:28

2²⁰¹⁷ . 7²⁰¹⁷ = 2^504.4+1.7^504.4+1 = ...2*...7 = ...4

So the units digit of 2²⁰¹⁷.7²⁰¹⁷ is 4
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