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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.
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Problem 2 8,992 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
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Problem 3 8,418 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
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Problem 4 7,823 viewsFind the number of terms:
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Problem 11 1,456 views 
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Problem 12 1,238 views 
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Problem 13 1,148 views 
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Problem 14 1,237 views 
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Problem 15 1,191 views 
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Problem 16 1,209 views 
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Problem 17 1,407 views 
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Problem 18 1,176 views 
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Problem 19 1,182 views
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