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Arithmetic Sequences  Problem 17
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
If you are asked to find the hundredth number in a pattern, you could write out all 100 numbers and hope you don't make any mistakes along the way, or you could use a shortcut: the explicit formula. The explicit formula is used to find any term in a number pattern if you know the d, or common difference being added/subtracted each time, and the first number in the pattern.
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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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Arithmetic Sequences
Problem 1 11,731 viewsGiven 11, 7, 3...
Find a_{301}. 
Arithmetic Sequences
Problem 2 9,005 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
Arithmetic Sequences
Problem 3 8,432 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
Arithmetic Sequences
Problem 4 7,835 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
Arithmetic Sequences
Problem 5 1,558 views 
Arithmetic Sequences
Problem 6 1,706 views 
Arithmetic Sequences
Problem 7 1,935 views 
Arithmetic Sequences
Problem 8 2,246 views 
Arithmetic Sequences
Problem 9 1,433 views 
Arithmetic Sequences
Problem 10 1,256 views 
Arithmetic Sequences
Problem 11 1,469 views 
Arithmetic Sequences
Problem 12 1,243 views 
Arithmetic Sequences
Problem 13 1,154 views 
Arithmetic Sequences
Problem 14 1,245 views 
Arithmetic Sequences
Problem 15 1,197 views 
Arithmetic Sequences
Problem 16 1,214 views 
Arithmetic Sequences
Problem 17 1,414 views 
Arithmetic Sequences
Problem 18 1,180 views 
Arithmetic Sequences
Problem 19 1,190 views
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