1. Problem Solving Process
Ronal Rifandi

2. Example Look at the group of number below
{1,3}, {5,7,9}, {11,13,15,17}, {19,21,23,25,27}
Determine the number of numbers in the 100th group

3. Steps of Problem Solving Process
Understanding the Problem
Note the pattern of the numbers
Look at the pattern of the number of element in the 1st , 2nd , 3rd … groups
Devising a plan
The n –th term in the pattern, can be determined
The number of elements in the n –th group can be determined
The key of this problem is in how we get the first term in the n –th group

4. Implementing the plan The n’ –th term in that sequence is Un’= 2n’ – 1
The number of elements in n – th group is
Bn= n+1
The number of elements until the n –th group is
The 1st term of the group (n+1)

5. The number of elements until the 99th group is
The 1st term of the 100th group is
The number of elements in the 100th group is
The last term in the 100th group is
The sum of number in the 100th group is

6. Reflecting the problem
Look at every formula that produced
Implement that formula into the group of number in the problem that easy to determine