Sum of Two Numbers
Sum Multiples of Three and Five
Factorial
Linear Search
Reverse String
Find Maximum
Average Value (Java 8 Lambdas and Streams)
Convert to Upper Case (Java 8 Lambdas and Streams)
Nth Odd Element
Number Of Tree Nodes
Count Nodes in List
Count Number of Leaf Nodes
Binary Tree Depth
Find Second Largest Number in Array

Given a number n, write a method that sums all multiples of three and five up to n (inclusive).