solve this one... ;)

[bravorajat]

you have got 20 bucks. You need to buy 6 objects using 20 bucks. and all the 20 bucks should get finished after buying 6 objects. some conditions should also be fulfilled -
1. the 6 objects should be bought in natural numbers.
2. you cant buy two objects of same amount.

Now tell me, how would you do that ?..

 

[daon2]

One mathematician might say 0+2+4+3+4+6.

Another mathematician might say you can't "do that"

Both are fine answers without an explicit definition given.

 

[daon2]

[SIZE=+1]Natural Numbers
Counting Numbers[/SIZE]​

The numbers used for counting. That is, the numbers 1, 2, 3, 4, etc.

That's definition I found.
It eliminates Daon's 0 ! (anyhow you don't pay $0 for something: it's a gift!!)
"21 bucks" would have a solution:
1,2,3,4,5,6 ' AHEM!

Buy 5 get one free? Really the "free" item is not free, it comes at a cost of buying 5 items!