Lesson eLearning

Find the 8th term of the pattern 1, 3, 6, 10, 15, 21, ...

medium 2 marks Class 5 · Mathematics · Can You See the Pattern
Answer
36

The correct answer is 36 — Compute 8(9)/2 = 72/2 = 36.

Step-by-step solution

  1. Recognise that the pattern is triangular numbers: nth term = n(n+1)/2.
  2. Set n = 8 for the 8th term.
  3. Compute 8(9)/2 = 72/2 = 36.
Common mistake: Using wrong formula or forgetting to divide by 2

Concept tested: Triangular number pattern

Published · How this solution was prepared and checked

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