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Sequences and Series Videos 12 videos
ACT Math: Intermediate Algebra: Drill 3, Problem 1. Find the fifth number in the series.
ACT Math: Intermediate Algebra Drill 3, Problem 2. Find the sixth number in the series.
ACT Math: Pre-Algebra Drill 4, Problem 2. What is the fourth term in the series?
SAT Math 1.5 Numbers and Operations 207 Views
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Description:
SAT Math 1.5 Numbers and Operations. How many dots would be in the 5 th term of this sequence?
Transcript
- 00:02
Here's an unshmoopy question you'll find on an exam somewhere in life...
- 00:06
These are the first three terms in a sequence.
- 00:09
How many dots would be in the 5th term of this sequence?
- 00:12
Here are the potential answers...
- 00:17
To solve this problem, we can either draw a ton of dots... or go the number route.
Full Transcript
- 00:23
First term: a column of 1, which means 1 dot total.
- 00:27
Second term: columns of 1, 3, 1, or 5 dots total.
- 00:32
Third term: columns of 1, 3, 5, 3, 1, or 13 dots total.
- 00:37
See the pattern yet?
- 00:40
Fourth term: columns of 1, 3, 5, 7, 5, 3, 1, or 25 dots total.
- 00:46
Fifth term: columns of 1, 3, 5, 7, 9, 7, 5, 3, 1...
- 00:51
When we add all the numbers, we get 41.
- 00:54
So the correct answer is (D).
- 00:55
As in, "Dot overload."
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