The electron concentration in a silicon material is 6x10²/cm³ at room temperature under equilibrium conditions. [1-11 What is the hole concentration ?
a. 1.75 x 10¹⁷
b. 2.75 x 10¹⁷
c. 5.75 x 10¹⁷
d. 75 x 10¹⁷
e. 3.75 x 10¹⁷