Please help me with this

Mathematics

1 answer:

WARRIOR [948]3 years ago

5 0

Not 100% sure if this is how you do it but I tried.

Answers:
10mi
approx. 42.98ft.
60yd
approx. 73.31ft.
approx. 0.90ft.
approx. 12.37ft.

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Rafael is taking a test that contains a section of 12 true-false questions. How many of the possible groups of answers to these

timurjin [86]

Answer:

Step-by-step explanation:

Rafael is taking a test that contains a section of 12 true-false questions. At least 6 correct answers of true means that 6 answers are true, 7 are true, 8 are true, 9 are true, 10 are true, 11 are true or 12 are true.

Then

$C_6^{12}=\dfrac{12!}{6!(12-6)!}=924,\\ \\C_7^{12}=\dfrac{12!}{7!(12-7)!}=792,\\ \\C_8^{12}=\dfrac{12!}{8!(12-8)!}=495,\\ \\C_9^{12}=\dfrac{12!}{9!(12-9)!}=220,\\ \\C_{10}^{12}=\dfrac{12!}{10!(12-10)!}=66,\\ \\C_{11}^{12}=\dfrac{12!}{11!(12-11)!}=12,\\ \\C_{12}^{12}=\dfrac{12!}{12!(12-12)!}=1.$