10x3k2
5x3k2
−5x2k3
−10x2k3
Correct answer is D
(x−k)5=5C0x5(−k)0+5C1x4(−k)1+...
The fourth term in the expansion = ^{5}C_{4 - 1}(x)^{5 - 3}(-k)^{3 = 10 \times x^{2} \times -k^{3}
= −10x2k3
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