Answer the Question and Tell Whether It Illustrates Inductive or Deductive

Short Answer

Answer the question and tell whether it illustrates inductive or deductive reasoning. Give the $6 \text { th }$ number in the pattern: $\begin{array} { l } 1 + 2 = 3 \\1 + 2 + 3 = 6 \\1 + 2 + 3 + 4 = 10 \\1 + 2 + 3 + 4 + 5 = 15\end{array}$ The $6 \text { th }$ number is __________. It illustrates __________ reasoning .