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Math help?
If you start at 1 and skip count by 3s, what is the 100th number in the sequence
Why do you have to subtract 2?
3 Answers
- llafferLv 75 months agoFavorite Answer
We can set up an arithmetic sequence to describe your number pattern. I use this general equation to describe the n'th term of such a sequence:
a(n) = a + b(n - 1)
where "a" is the first term (1) and "b" is the common difference (3). Substitute and simplify to get:
a(n) = 1 + 3(n - 1)
a(n) = 1 + 3n - 3
a(n) = 3n - 2
The 100th term is then:
a(100) = 3(100) - 2
a(100) = 300 - 2
a(100) = 298
