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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 11,333 viewsGiven 11, 7, 3...
Find a_{301}. 
Arithmetic Sequences
Problem 2 8,685 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
Arithmetic Sequences
Problem 3 8,064 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
Arithmetic Sequences
Problem 4 7,523 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
Arithmetic Sequences
Problem 5 1,365 views 
Arithmetic Sequences
Problem 6 1,442 views 
Arithmetic Sequences
Problem 7 1,387 views 
Arithmetic Sequences
Problem 8 1,811 views 
Arithmetic Sequences
Problem 9 1,115 views 
Arithmetic Sequences
Problem 10 1,027 views 
Arithmetic Sequences
Problem 11 1,184 views 
Arithmetic Sequences
Problem 12 1,042 views 
Arithmetic Sequences
Problem 13 974 views 
Arithmetic Sequences
Problem 14 1,019 views 
Arithmetic Sequences
Problem 15 995 views 
Arithmetic Sequences
Problem 16 1,018 views 
Arithmetic Sequences
Problem 17 1,090 views 
Arithmetic Sequences
Problem 18 979 views 
Arithmetic Sequences
Problem 19 972 views
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