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2, 6, 10, 14, ...

In the sequence above, each term after the first is 4 greater than the preceding term. Which of the following is not a term in the sequence?

A. 90
B. 150
C. 160
D. 170
E. 210

1 Answer

5 votes

The sequence can be represented by
2 + 4x, where
x is a whole number(
x \geq 0 and
x is an integer). By this, we should be able to plug in some whole number x and be able to get these values if they are in the sequence. To test this, let's set these numbers equal to
2 + 4x and confirm that there is a whole number x which equals the values selected.



2 + 4x = 90 \Rightarrow 4x = 88 \Rightarrow x = 22 \, \checkmark


2 + 4x = 150 \Rightarrow 4x = 148 \Rightarrow x = 37 \, \checkmark


2 + 4x = 160 \Rightarrow 4x = 158 \Rightarrow x = 39.5


When trying 160 with our equation, we find that x doesn't equal a whole number, thus our answer is C, or 160. To confirm our answer, we can test 170 and 210 and confirm that they both give us a value for x which is a whole number.



2 + 4x = 170 \Rightarrow 4x = 168 \Rightarrow x = 42 \, \checkmark


2 + 4x = 210 \Rightarrow 4x = 208 \Rightarrow x = 52 \, \checkmark

User Janel
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