Binomial TheoremHard

Question

If k ∈ R and the middle term of is 1120, then value of k is:

Options

A.3

B.2

C.-3

D.-4

Solution

middle term = T₅
T₅ = T_{4 + 1} = ⁸C₄ . k⁴ = 1120
⇒ k = 2

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