Tháng Tư 2, 2026

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: Tính tổng${{1.3}^{0}}{{.5}^{n-1}}C_{n}^{n-1}+{{2.3}^{1}}{{.5}^{n-2}}C_{n}^{n-2}+…+n{{.3}^{n-1}}{{5}^{0}}C_{n}^{0}$

Choose the word that has different primary stress: Difficult, Animal, Volunteer, Interest.

What is your ……… subject at school?