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hasnain

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From: Chichawatni

Registered: 2014-10-13

Posts: 8,355

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: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

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