the middle in the expansion of `(a+b)^10` is `T_(r-1)` then `r=`

The middle term in the expansion of (1+1/x)^10 is

The middle term in the expansion of (x+(1)/(x))^10 is

If the middle term in (a+b)^(10) " is " T_(r-1) then r = ……

The middle terms in the expansion of (x+(1)/(x))^(10) is-

Suppose k in R . Let a be the coefficient of the middle term in the expansion of (k/x+x/k)^(10) and b be the term independent of x in the expansion of ((k^(2))/x+x/k)^(10) . If a/b=1 , then k is equal to

If r^(th) term is the middle term in the expansion of (x^(2)-(1)/(2x))^(20), then (r+3)^(th) term is

If r^(th) term is the middle term in the expansion of (x^2-1/(2x))^20 , then (r+3)^(th) term is