Find the sum of all 2 digit numbers divisible by 3.

Options
- 1665
- 2008
- 1600
- 1565

CORRECT ANSWER : 1665

Discussion Board
Method

Step 1. Find first and last:
First: 12 Last: 99
Step 2. Find all numbers
[(99 - 12) / 3] + 1 = 30 numbers in total.
Step 3. Apply the arithmetic series formula
Sum = n * (First + Last) / 2
Sum = 30 * (12 + 99) / 2 = 1665

Ioannis 10-30-2014 11:25 AM

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