Question:
The 20th term in the triangular numbers 1, 3, 6, 10, 15, 21, ... is
The 20th term in the triangular numbers 1, 3, 6, 10, 15, 21, ... is
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Remember triangular number formula: $\frac{n(n+1)}{2}$.
Updated On: Feb 27, 2026
- 190
- 195
- 200
- 210
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The Correct Option is D
Solution and Explanation
Concept:
Triangular number formula:
\[
T_n = \frac{n(n+1)}{2}
\]
Explanation:
For $n = 20$:
\[
T_{20} = \frac{20 \times 21}{2} = 210
\]
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