K KingAce New member Joined Oct 12, 2006 Messages 44 Feb 7, 2008 #1 What's the sum of all 3 digit numbers that are a multiple of 3? Please help! I've been trying for 15 minutes to get the answer, but am having a rly hard time doing so!
What's the sum of all 3 digit numbers that are a multiple of 3? Please help! I've been trying for 15 minutes to get the answer, but am having a rly hard time doing so!
S soroban Elite Member Joined Jan 28, 2005 Messages 5,584 Feb 8, 2008 #2 Hello, KingAce! What's the sum of all 3-digit numbers that are a multiple of 3? Click to expand... \(\displaystyle \text{You want: }\:S \;=\;102 + 105 + 108 + \hdots + 999\) \(\displaystyle \text{This is an arithmetic series with first term }a = 102\), . . \(\displaystyle \text{common difference }d=3\text{, and }n = 300\text{ terms.}\) Got it?
Hello, KingAce! What's the sum of all 3-digit numbers that are a multiple of 3? Click to expand... \(\displaystyle \text{You want: }\:S \;=\;102 + 105 + 108 + \hdots + 999\) \(\displaystyle \text{This is an arithmetic series with first term }a = 102\), . . \(\displaystyle \text{common difference }d=3\text{, and }n = 300\text{ terms.}\) Got it?
