The triangular numbers are the following: T = 1,T = 3, T3 = 6, T4 =...

 

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The triangular numbers are the following: T = 1,T = 3, T3 = 6, T4 = 10, ... They are called triangular numbers because you can think of the number as a series of dots which can be arranged into a triangle as shown below: T-1 T-3 T3-6 The formula for the nth triangular number is Tn is 10, so T = 10. 2628 is a triangular number. Which one is it? 74-10 n(n+1) = 2 -. For example, the fourth triangular number For example, if 2628 happened to be the 4th triangular number (which of course it's not), your answer would be 4. The triangular numbers are the following: T = 1,T = 3, T3 = 6, T4 = 10, ... They are called triangular numbers because you can think of the number as a series of dots which can be arranged into a triangle as shown below: T-1 T-3 T3-6 The formula for the nth triangular number is Tn is 10, so T = 10. 2628 is a triangular number. Which one is it? 74-10 n(n+1) = 2 -. For example, the fourth triangular number For example, if 2628 happened to be the 4th triangular number (which of course it's not), your answer would be 4.