Tìm số hạng đứng giữa trong khai triển $(x^{3}+xy)^{21}$

Question

Cơ bản

4 câu trả lời

Answer 1

$C_{21}^{10}x^{43}y^{10};C_{21}^{11}x^{41}y^{11}$

Answer 2

$C_{21}^{11}x^{41}y^{11}$

Answer 3

$C_{21}^{10}x^{43}y^{10}$

Answer 4

$C_{21}^{10}x^{40}y^{10}$