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Question: 1/ what is the sum of all numbers between 1 and 1000?
Answers: 1/ what is the sum of all numbers between 1 and 1000?
499499
49999
500,500
?
1.998
500500
499,999
There's a trick to figuring this out quickly.
For each number between 1 and 499 there is a corresponding number between 501 and 999 which, when added together, equals 1000.
For example:
1 + 999 = 1000
2 + 998 = 1000
...
499 + 501 = 1000
Now, there are 499 pairs like that. Add them together and you get 499,000
Add to that 1000 and 500, and you get 500,500, which is your total.
a big number
1000 times 499 plus 1000 plus 500
wtvr that is
500500
1000
s=n/2(a+l)
=>s=1000/2(1+1000)=500*1001=500500
Took me 15 sec.
You think you're really smart? Throw some real challenge.
A Lot...!!
yep am smart but who ever answers this right is smarter.