How many triangular numbers are between 11 and 39?

Answer 1

Oh, dude, triangular numbers are like the cool kids of math, they're all about those equilateral vibes. So, between 11 and 39, we've got 15 and 21 as triangular numbers. That's it, just those two. It's like a tiny exclusive club, you know?

Answer 2

Well, honey, let me break it down for you. Triangular numbers are the sum of consecutive natural numbers starting from 1. So, between 11 and 39, we have the triangular numbers 15, 21, and 28. That's a total of 3 triangular numbers in that range. Hope that clears things up for you, darling.

Answer 3

5 and I also got it in a test so I think you actually did use bond 11+

Answer 4

5

Answer 5

5

Answer 6

4

Answer 7

4

Answer 8

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Answer 9

Plj

Answer 10

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