the professor wants to write and ordered 7-questions from a pool of 10 questions
in the question, its already indicate that the questions must be in order
therefore, we must use permutation, because order does matters
P(10, 7)
= 10!/(10 - 7)!
= 10!/3!
= 604,800 different forms of the test can the professor write
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the professor wants to write and ordered 7-questions from a pool of 10 questions
in the question, its already indicate that the questions must be in order
therefore, we must use permutation, because order does matters
P(10, 7)
= 10!/(10 - 7)!
= 10!/3!
= 604,800 different forms of the test can the professor write