Solve the Problem Using Inductive Reasoning $t _ { 6 } = 21$

Multiple Choice

Solve the problem using inductive reasoning.
-Find the 6th triangular number that corresponds to the following dot sequence.

A) $t _ { 6 } = 21$
B) $t _ { 6 } = 18$
C) $t _ { 6 } = 42$
D) $\mathrm { t } _ { 6 } = 15$