Question

A triangular number pattern is formed using chocolates, find the number of chocolates in ${11}^{th}$ term of the pattern.

• A. 66
• B. 50
• C. 56
• D. 60

Answer 1

The correct option is A 66

Given: Triangular number pattern of chocolates

We know that number of items in $n^{th}$ term of a triangular number pattern is $\frac{n(n+1)}{2}$.

So, number of chocolates in ${11}^{th}$ term = $\frac{11(11+1)}{2}$
Number of chocolates in ${11}^{th}$ term = $\frac{11\left(12\right)}{2}$
Number of chocolates in ${11}^{th}$term = 11 $\times$ 6 = 66