Respuesta :

calculista
step 1
calculate the value for i=1
=(4*(1/2) ^(1-1))---> 4

step 2
calculate the value for i=2
=(4*(1/2) ^(2-1))---> 2

step 3
calculate the value for i=
=(4*(1/2) ^(3-1))---> 4*(1/4)---->1

step 4
find the sum
(4+2+1)=7