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Finding unknown terms in a number sequences is essentially the same as finding a mean. For an arithmetic sequence, you could find unknown terms if you knew the d, or difference value. To find d, start by writing an equation starting from your first known term, plus some number of d's equals your second known term. Once you have solved for d, you can find any term from the explicit formula.
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Sample Problems (19)
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Arithmetic Sequences
Problem 1 9,082 viewsGiven 11, 7, 3...
Find a_{301}. 
Arithmetic Sequences
Problem 2 6,921 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
Arithmetic Sequences
Problem 3 6,376 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
Arithmetic Sequences
Problem 4 5,883 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
Arithmetic Sequences
Problem 5 329 views 
Arithmetic Sequences
Problem 6 306 views 
Arithmetic Sequences
Problem 7 276 views 
Arithmetic Sequences
Problem 8 328 views 
Arithmetic Sequences
Problem 9 82 views 
Arithmetic Sequences
Problem 10 84 views 
Arithmetic Sequences
Problem 11 76 views 
Arithmetic Sequences
Problem 12 83 views 
Arithmetic Sequences
Problem 13 75 views 
Arithmetic Sequences
Problem 14 77 views 
Arithmetic Sequences
Problem 15 80 views 
Arithmetic Sequences
Problem 16 71 views 
Arithmetic Sequences
Problem 17 83 views 
Arithmetic Sequences
Problem 18 76 views 
Arithmetic Sequences
Problem 19 80 views
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