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kakasveta [241]
3 years ago
6

What is the next term in the following sequence? 54, -18, 6, ... 3 2 -3 -2

Mathematics
2 answers:
Mars2501 [29]3 years ago
8 0

Answer:

D. -2

Step-by-step explanation:

Hope it helped UwU

dusya [7]3 years ago
6 0

Answer:

The next term is - 2 ⇒ last answer

Step-by-step explanation:

∵ The sequence is 54 , -18 , 6 , ......

∵ -18 ÷ 54 = -\frac{1}{3}

∵ 6 ÷ -18 = -\frac{1}{3}

- There is a constant ratio between each two consecutive terms

∴ The sequence is a geometric sequence

The nth rule of the geometric sequence is a_{n}=a(r)^{n-1} , where

  • a is the first term
  • r is the constant ratio between each two consecutive terms

∵ The first term = 54

∴ a = 54

∵ The constant ratio = -\frac{1}{3}

∴ r =  -\frac{1}{3}

∵ The next term is the fourth term

∴ n = 4

- Substitute a, r and n in the rule above

∴ a_{4}=54(-\frac{1}{3})^{4-1}

∴ a_{4}=54(-\frac{1}{3})^{3}

∴ a_{4}=54(-\frac{1}{27})

∴ a_{4}=-2

The next term is - 2      

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