Question

Here’s the problem (sorry I just thought it would be easier if I send the picture instead):

Answer 1

Question 9

Given

n=100

The triangular numbers are given by the following explicit formulas:

n=100

$\begin{gathered} T_n=\frac{n(n+1)}{2} \\ \\ T_{100}=\frac{100(100+1)}{2} \\ \\ T_{100}=\frac{100(101)}{2} \\ \\ T_{100}=\frac{100(101)}{2} \\ \\ T_{100}=\frac{10100}{2} \\ \\ T_{100}=5050 \end{gathered}$