You are not logged in.
- Topics: Active | Unanswered
Pages:: 1
#1 2015-05-23 05:23:52
:Sum Of All
Question:
Find the sum of all 2 digit numbers divisible by 3.
Option A):
1565
Option B):
1600
Option C):
1665
Option D):
2008
Correct Answer is Option C):
1665
Explanation:
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
Failure is the first step towards seccess.
Offline
2015-05-23 05:23:52
- Advertisement
- Ads By Google
Re: :Sum Of All
\n
Pages:: 1