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Arithmetic Sequences  Problem 19
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
In order to find any missing terms in an arithmetic sequence, you need to know the common difference, d, that is being added to get from one term to the next in the list. In order to find this, count how many missing terms there are between your two given values, and use those to solve for d. (Lower given number plus so many counted d's equals higher given number.) From there, you can solve for any term number in the list, including the fist, using the arithmetic explicit formula: nth term = first term plus d(n  1).
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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 11,044 viewsGiven 11, 7, 3...
Find a_{301}. 
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Problem 2 8,441 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
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Problem 3 7,814 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
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Problem 4 7,273 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
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Problem 5 1,217 views 
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Problem 6 1,302 views 
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Problem 7 1,060 views 
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Problem 8 1,369 views 
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Problem 9 939 views 
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Problem 10 865 views 
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Problem 11 971 views 
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Problem 12 874 views 
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Problem 13 830 views 
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Problem 14 847 views 
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Problem 15 838 views 
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Problem 16 870 views 
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Problem 17 845 views 
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Problem 18 814 views 
Arithmetic Sequences
Problem 19 817 views
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