We have to add the voltage value from the two diode that will be 1.4volt
we subtract the power source voltage of 10vol minus 1.4volt= 8.6volt
then we add the total resistance in series that is 3.3kohms
so now we use the ohms formula of current
I= V/R
I= 8.6v/ 3.3kohms
l= 2.60mA