Question

Find the middle term in the expansion of (5/x+x/5)^10

Answer 1

total number of term = 10+1= 11 . r +1= 6 then r=5 ,x= 10 and a=1 ,b = -1/x . n(r) = 10C5 1^10-5(1/x)^5 . 10C^5 1^5 × 1^5/-x5. = 10×9×8×7×6^n/1×2×5×4×5 × 1/-x^5. answer= -122^1/x5