Question

Answer the following question:
Which is the smallest triangular number?​

Answer 1

Answer:

The starting triangular numbers are 1, 3, 6, 10, 15, 21, 28………… Smallest triangular number with 2 digits = 10, and 4 is the index of 10. 3 digits = 105, and 14 is the index of 105.

Answer 2

Answer:

The starting triangular numbers are 1, 3, 6, 10, 15, 21, 28………… Smallest triangular number with 2 digits = 10, and 4 is the index of 10. 3 digits = 105, and 14 is the index of 105