# Question #45224

${2}^{25}$
If it were only one question, there would be $2 = {2}^{1}$ F-T alternatives, and thus, answer keys.
If there were 2 questions, there would be ${2}^{1} \times {2}^{1} = {2}^{2}$ alternatives.
If you are comfortable with that line of argument, you see that for 25 questions it grows rapidly to ${2}^{25}$.