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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 2.1 Numbers and Operations 218 Views
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Description:
SAT Math 2.1 Numbers and Operations. How many dots will be in the 6 th term of this sequence?
Transcript
- 00:03
Hope you left room for an extra helping of Shmoop.
- 00:06
How many dots will be in the 6th term of this sequence?
- 00:10
And here are the potential answers:
- 00:14
Oh look! We're building bigger and bigger triangles!
- 00:17
Looks like there's a pattern here...
Full Transcript
- 00:24
So from the first dot to the second picture...we have columns of 1 dot and 3 dots...
- 00:30
…from the second to the third...we get columns of 1, 3, and 5 dots...
- 00:33
So it looks like we're increasing the number of dots in each column by 2 as we go from term to term.
- 00:39
So the fourth term will have columns of 1, 3, 5, 7…for 16 dots total…
- 00:45
The fifth term will have columns of 1, 3, 5, 7, 9… or 25 dots total…
- 00:51
…and the sixth term will have columns of 1, 3, 5, 7, 9, 11…or 36 dots total.
- 00:57
Answer's E.
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