Question

(10*2^n)/(2^n+1+2^n-1)

Answer 1

(10*2^n)/(2*2^n+(1/2)*2^n)=(10*2^n)/2*n(2+1/2)=(2^n)=10/2,5=4

Answer 2

$<var>\frac{10*2^n}{2^n+1+2^n-1}=\frac{10*2^n}{2*2^n}=5</var>$