Math!

[Mujklob]

What is the sum of all the natural numbers below 1000 that are multiples of 3 or 5?

[-PHXN- New001]

I just googled it XD

So I won't wreck it for others.

[Vameq]

too much thinking...i'd have to remove data of hunter dps, nightelves, blizzards, and final fantasy tactics job combinations to figure it out without wasting time =/

[Citizenmanman]

Sum of numbers up to 1000 = (1/2)*1000*1001 = 500500

Sum of numbers divisible by 2 up to 1000 = 2*(1+2+...500) = 2*(1/2)*500*501 = 250500

Sum of numbers divisible by 5 up to 1000 = 5*(1+2+...200) = 5*(1/2)*200*201 = 100500

Sum of numbers divisible by both 2 and 5 up to 1000

= 10*(1+2+3+...100) = 10*(1/2)*100*101 = 50500

Required sum = 500500 - 250500 - 100500 + 50500 = 200000

[BigNeckLawnBoy]

MY HEAD!

[professa X]

Wow. Just write up a simple code. Had an interview question just like this.

Int main ()

{

Int sum=0;

For (int I=0; I< 1000;I++)

{

If (i%3==0 || i%5 ==0)

Sum += I;

}

Print (sum)

Return 0;

}

[ElementalCards]

MY HEAD!

What was once a math wizard, I became a total dope afterwards during my sophomore year in HS. Too bad I never aced math ever since.

[BigNeckLawnBoy]

OH MY HEAD!