What is the sum of the last five coefficients in the expansion of (1+x)^9 when it is expanded in ascending powers of x?

NDA 2020 Mathematics question

What is the sum of the last five coefficients in the expansion of when it is expanded in ascending powers of x?

Answer: (A)

The expansion has 10 coefficients whose total is . By symmetry $9r =

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Question ID VK-029220