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77julia77 [94]
2 years ago
9

Helpppppp I’m literally going insane

Mathematics
2 answers:
Sliva [168]2 years ago
6 0
X= -1 and X= -1.5 do the last one
Bezzdna [24]2 years ago
4 0
X = -1 and -1.5 so the 4th answer
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<span>Note: Let C denote correct and I denote incorrect. Suppose that guessing results in 8 correct and 2 incorrect answers. One possible outcome is CCCCCCCCII, for example. We can think of the number of ways of getting exactly 8 correct to be the same as the number of ways of selecting 8 spots for the correct answers times the number of ways of selecting two spots for the remaining two answers. There are (10 C 8) ways to select the positions for the correct answers and precisely one way to select the remaining two positions for the incorrect answers. Therefore, there are there are 10 C 8 = 45 ways to get 8 correct. Similarly, there are 10 C 9 = 10 ways to get 9 correct, and 10 C 10 = 1 way to get all 10 correct.</span>
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3 years ago
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4 0
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