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An arithmetic mean is a term in a number sequence that has been omitted, and we are asked to find it. If you have two terms with one mean between them, then that mean will literally be the mean, or average of the terms on either side of it. We need to add those terms together and divide by two.
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Concept (1)
Sample Problems (19)
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Arithmetic Sequences
Problem 1 9,034 viewsGiven 11, 7, 3...
Find a_{301}. 
Arithmetic Sequences
Problem 2 6,889 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
Arithmetic Sequences
Problem 3 6,351 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
Arithmetic Sequences
Problem 4 5,845 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
Arithmetic Sequences
Problem 5 313 views 
Arithmetic Sequences
Problem 6 288 views 
Arithmetic Sequences
Problem 7 263 views 
Arithmetic Sequences
Problem 8 311 views 
Arithmetic Sequences
Problem 9 68 views 
Arithmetic Sequences
Problem 10 68 views 
Arithmetic Sequences
Problem 11 62 views 
Arithmetic Sequences
Problem 12 71 views 
Arithmetic Sequences
Problem 13 63 views 
Arithmetic Sequences
Problem 14 67 views 
Arithmetic Sequences
Problem 15 66 views 
Arithmetic Sequences
Problem 16 63 views 
Arithmetic Sequences
Problem 17 67 views 
Arithmetic Sequences
Problem 18 66 views 
Arithmetic Sequences
Problem 19 66 views
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