What is the sum of the three consecutive triangular numbers after fifteen?​

The triangular number sequence is the representation of the numbers in the form of equilateral triangle arranged in a series or sequence. These numbers are in a sequence of 1, 3, 6, 10, 15, 21, 28, 36, 45, and so on. The numbers in the triangular pattern are represented by dots. The sum of the previous number and the order of succeeding number results in the sequence of triangular numbers. We will learn more here in this article.

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1)a

2 b

3 d

4 d or b

explanation:

wrong! the answer is c.