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Which of the following?

The first and third terms of an arithmetic sequence are -1 and 5, respectively. Which of the following is the sixth term? 
 
a) -25
b) 11
c) 14
d) 29
e) 3125
 
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2 Answers

-1    ?    5    ?    ?    ?
 
[5-(-1)]/2=6/2=3 (add 3)
 
-1    2    5    8    11    14
 
c) is the answer

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You are very welcome, Sun.
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