Find 7th term in the expansion of (2x/5 +5/2x)^9.
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Answer:4375/x^4T(6+1)=8C6 (4x/5)^8-6(6/2x)^68×7×6!/6!×2×1(4x/5)^2(5/2x) ^628×16x^2/25×15625/64x^64375/x4
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