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Arithmetic Sequences  Problem 18
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
Finding unknown terms in a number sequences is essentially the same as finding a mean. For an arithmetic sequence, you could find unknown terms if you knew the d, or difference value. To find d, start by writing an equation starting from your first known term, plus some number of d's equals your second known term. Once you have solved for d, you can find any term from the explicit formula.
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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 11,189 viewsGiven 11, 7, 3...
Find a_{301}. 
Arithmetic Sequences
Problem 2 8,561 viewsGiven a_{20} = 101 and a_{21} = 104,
find the general term, a_{n}. 
Arithmetic Sequences
Problem 3 7,921 viewsGiven a_{11} = 52, a_{19} = 92,
find a_{1001} 
Arithmetic Sequences
Problem 4 7,406 viewsFind the number of terms:
7 , 13 , 19 ... 85 3 3 3 3 
Arithmetic Sequences
Problem 5 1,279 views 
Arithmetic Sequences
Problem 6 1,363 views 
Arithmetic Sequences
Problem 7 1,192 views 
Arithmetic Sequences
Problem 8 1,550 views 
Arithmetic Sequences
Problem 9 1,009 views 
Arithmetic Sequences
Problem 10 937 views 
Arithmetic Sequences
Problem 11 1,074 views 
Arithmetic Sequences
Problem 12 950 views 
Arithmetic Sequences
Problem 13 888 views 
Arithmetic Sequences
Problem 14 923 views 
Arithmetic Sequences
Problem 15 904 views 
Arithmetic Sequences
Problem 16 926 views 
Arithmetic Sequences
Problem 17 945 views 
Arithmetic Sequences
Problem 18 883 views 
Arithmetic Sequences
Problem 19 887 views
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