exam Maths Puzzle Numerical Ability

What is the formula that I would use to solve this problem. What are all the possible combinations for an answer queue if you have 25 true/false questions? Thanks for all your help

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Please help with: The measures of the angles of a triangle are 3 consecutive even integers. Find the measure of each angle (x-11)/(x^2-9) - (x-7)/x^2-3x)