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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 11,507 viewsGiven 11, 7, 3...
Find a_{301}. 
Arithmetic Sequences
Problem 2 8,832 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
Arithmetic Sequences
Problem 3 8,219 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
Arithmetic Sequences
Problem 4 7,665 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
Arithmetic Sequences
Problem 5 1,440 views 
Arithmetic Sequences
Problem 6 1,543 views 
Arithmetic Sequences
Problem 7 1,608 views 
Arithmetic Sequences
Problem 8 1,997 views 
Arithmetic Sequences
Problem 9 1,254 views 
Arithmetic Sequences
Problem 10 1,120 views 
Arithmetic Sequences
Problem 11 1,302 views 
Arithmetic Sequences
Problem 12 1,129 views 
Arithmetic Sequences
Problem 13 1,051 views 
Arithmetic Sequences
Problem 14 1,110 views 
Arithmetic Sequences
Problem 15 1,076 views 
Arithmetic Sequences
Problem 16 1,098 views 
Arithmetic Sequences
Problem 17 1,239 views 
Arithmetic Sequences
Problem 18 1,059 views 
Arithmetic Sequences
Problem 19 1,062 views
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