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Arithmetic Sequences  Problem 18
Alissa Fong
Alissa Fong
MA, Stanford University
Teaching in the San Francisco Bay Area
Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts
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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Alissa Fong
M.A. in Secondary Mathematics, Stanford University
B.S., Stanford University
Alissa has a quirky sense of humor and a relatable personality that make it easy for students to pay attention and understand the material. She has all the math tips and tricks students are looking for.
Your tutorials are good and you have a personality as well. I hope you have more advanced college level stuff, because I like the way you teach.”
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Sample Problems (19)
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Arithmetic Sequences
Problem 1 10,587 viewsGiven 11, 7, 3...
Find a_{301}. 
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Problem 2 8,126 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
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Problem 3 7,421 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
Arithmetic Sequences
Problem 4 7,011 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
Arithmetic Sequences
Problem 5 1,071 views 
Arithmetic Sequences
Problem 6 1,167 views 
Arithmetic Sequences
Problem 7 912 views 
Arithmetic Sequences
Problem 8 1,169 views 
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Problem 9 789 views 
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Problem 10 751 views 
Arithmetic Sequences
Problem 11 829 views 
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Problem 12 759 views 
Arithmetic Sequences
Problem 13 723 views 
Arithmetic Sequences
Problem 14 731 views 
Arithmetic Sequences
Problem 15 727 views 
Arithmetic Sequences
Problem 16 755 views 
Arithmetic Sequences
Problem 17 729 views 
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Problem 18 714 views 
Arithmetic Sequences
Problem 19 688 views
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