There are 25,053,600 different tests of 5 questions each that can be made from Ms. Wood's collection of 25 questions.
To find the number of different tests of 5 questions each that can be made from a set of 25 questions, you can use the combination formula. The combination formula is:
n! / (r! * (n-r)!)
Where n is the total number of items and r is the number of items being chosen at a time.
In this case, n is 25 (the total number of questions) and r is 5 (the number of questions per test). Plugging these values into the formula gives:
25! / (5! * (25-5)!) = 25! / (5! * 20!) = 25 * 24 * 23 * 22 * 21 / (5 * 4 * 3 * 2 * 1) = 25,!053,!600
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