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Sequences and Series Videos 8 videos
Sequences are nice. Without them, there would be no rhyme or reason to anything—no way to ever know what’s coming next. And it would make tryin...
SAT Math 1.5 Numbers and Operations. How many dots would be in the 5th term of this sequence?
SAT Math 2.1 Numbers and Operations. How many dots will be in the 6th term of this sequence?
SAT Math 1.5 Numbers and Operations 208 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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