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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.
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.”
Thanks alot for such great lectures... I never found learning this easier ever before... keep up the great work.... :)”
You seem so kind, it's awesome. Easier to learn from people who seem to be rooting for ya!' thanks”
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Sample Problems (19)
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Arithmetic Sequences
Problem 1 10,840 viewsGiven 11, 7, 3...
Find a_{301}. 
Arithmetic Sequences
Problem 2 8,291 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
Arithmetic Sequences
Problem 3 7,652 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
Arithmetic Sequences
Problem 4 7,131 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
Arithmetic Sequences
Problem 5 1,143 views 
Arithmetic Sequences
Problem 6 1,238 views 
Arithmetic Sequences
Problem 7 976 views 
Arithmetic Sequences
Problem 8 1,260 views 
Arithmetic Sequences
Problem 9 869 views 
Arithmetic Sequences
Problem 10 811 views 
Arithmetic Sequences
Problem 11 906 views 
Arithmetic Sequences
Problem 12 820 views 
Arithmetic Sequences
Problem 13 778 views 
Arithmetic Sequences
Problem 14 791 views 
Arithmetic Sequences
Problem 15 788 views 
Arithmetic Sequences
Problem 16 816 views 
Arithmetic Sequences
Problem 17 786 views 
Arithmetic Sequences
Problem 18 774 views 
Arithmetic Sequences
Problem 19 759 views
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