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Which of the following arithmetic sequences have a common difference of 2.5?

Which of the following arithmetic sequences have a common difference of 2.5?-example-1

1 Answer

7 votes

Remember that

In the arithmetic sequence, the difference between two consecutive terms is called the common difference d.

so

Verify the common difference in each sequence

N 1

a1=-5

a2=-3 1/2=-3.5

a2-a1=-3.5-(-5)=1.5 ------> is not the answer

N 2

a1=2 1/2=2.5

a2=4 1/2=4.5

a2-a1=4,5-2.5=2 ----> is not the answer

N 3

a1=1.5

a2=3

a2-a1=3-1.5=1.5 ----> is not the answer

N 4

a1=-4

a2=-1.5

a2-a1=-1.5-(-4)=2.5 -------> is the answer

therefore

The answer is the option N 4

User Josebama
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