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jeka94
3 years ago
10

Which number line best shows how to solve −2 − (−4)?

Mathematics
2 answers:
bija089 [108]3 years ago
4 0

Answer:

the answer is 2. there arwnt any number lines so

frutty [35]3 years ago
3 0
-2-(-4)
-2+4

calculate the sum and the correct answer is
2
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Prove that C(50,3) + C(50,4) = C(51,4)
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By definition of the binomial coefficient,

C(n,k) = \dfrac{n!}{k!(n-k)!}

so we have

C(50,3) + C(50,4) = \dfrac{50!}{3!47!} + \dfrac{50!}{4!46!} \\\\ = \dfrac{50!}{3!46!} \left(\dfrac1{47} + \dfrac14\right) \\\\ = \dfrac{50!}{3!46!} \times \dfrac{51}{188} \\\\ = \dfrac{51!}{3!46!} \times \dfrac1{4\times47} \\\\ = \dfrac{51!}{4!47!} \\\\ = \dfrac{51!}{4!(51-4)!} = C(51,4)

as required.

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2 years ago
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Step-by-step explanation:

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2 years ago
23. The letters of the alphabet are written on
Alla [95]

Answer:

21/676

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3 years ago
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